Add issue templates and configure KeywordLabeler app

.github/ISSUE_TEMPLATE/bug.yml

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+# GitHub issue form. For more information see:
+# https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/syntax-for-issue-forms
+
+name: Report something is not working properly 🐛
+description:
+  Use this if there is something that is not working properly.  If you are not
+  sure or you need help making something work, please ask a question instead.
+labels: priority:❓, type:bug
+body:
+  - type: markdown
+    attributes:
+      value:
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description: Please tell us what happened that shouldn't have.
+      placeholder: What happened that shouldn't have.
+    validations:
+      required: true
+  - type: textarea
+    id: what-expected
+    attributes:
+      label: What did you expect instead?
+      description: Please tell us what did you expect to happen.
+      placeholder: What did you expect to happen.
+    validations:
+      required: true
+  - type: dropdown
+    id: version
+    attributes:
+      label: Affected version(s)
+      description:
+        Which version(s) have you tried and found this issue in? (if you see
+        this issue **not** happening on any version, please let us know in the
+        "Extra information").
+      multiple: true
+      options:
+        - I don't know (version:❓)
+        - An older version (version:old)
+        - v0.1.x (version:0.1.x)
+    validations:
+      required: true
+  - type: dropdown
+    id: part
+    attributes:
+      label: Affected part(s)
+      description:
+        Which parts of the repo are affected by this issue? Select all that
+        apply.
+      multiple: true
+      options:
+        - I don't know (part:❓)
+        - Documentation (part:docs)
+        - Unit, integration and performance tests (part:tests)
+        - Build script, CI, dependencies, etc. (part:tooling)
+        - Channels implementation (part:channels)
+    validations:
+      required: true
+  - type: textarea
+    id: extra
+    attributes:
+      label: Extra information
+      description:
+        Please write here any extra information you think it might be relevant,
+        e.g., if this didn't happened before, or if you suspect where the
+        problem might be.
+      placeholder: Any extra information you think it might be relevant.

.github/ISSUE_TEMPLATE/config.yml

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+# GitHub issue template chooser. For more information see:
+# https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository#configuring-the-template-chooser
+
+blank_issues_enabled: true
+contact_links:
+  - name: Ask a question ❓
+    url: https://github.com/frequenz-floss/frequenz-channels-python/discussions/new?category=support
+    about: Use this if you are not sure how to do something, have installation problems, etc.

.github/ISSUE_TEMPLATE/feature.yml

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+# GitHub issue form. For more information see:
+# https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/syntax-for-issue-forms
+
+name: Request a feature or enhancement ✨
+description: Use this if something is missing or could be done better or more easily.
+labels: part:❓, priority:❓, type:enhancement
+body:
+  - type: markdown
+    attributes:
+      value:
+        Thanks for taking the time to fill out this feature or enhancement
+        request!
+  - type: textarea
+    id: whats-needed
+    attributes:
+      label: What's needed?
+      description:
+        Please tell us what's missing or what could be done better or more easily.
+      placeholder: What's missing or what could be done better or more easily.
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed solution
+      description:
+        Please tell us how you think the needs above can be fulfilled. Only
+        fill this field if it wasn't described above.
+      placeholder:
+        How do you think the needs above can be fulfilled. Only fill this field
+        if it wasn't described above.
+  - type: textarea
+    id: use-cases
+    attributes:
+      label: Use cases
+      description:
+        Please tell us about the main use cases you see for this new feature or
+        enhancement to help us understand more.
+      placeholder:
+        The main use cases you see for this new feature or enhancement to help
+        us understand more.
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives and workarounds
+      description:
+        Please tell us if you tried any alternatives or workarounds for these
+        use cases and how (un)useful they were.
+      placeholder:
+        Any alternatives or workarounds for these use cases and how (un)useful
+        they were.
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description:
+        Please add any additional information here - screenshots, diagrams, etc.
+      placeholder: Any additional information here - screenshots, diagrams, etc.

.github/keylabeler.yml

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+# KeywordLabeler app configuration. For more information check:
+# https://github.com/ZeWaka/KeywordLabeler#readme
+
+# Determines if we search the title (optional). Defaults to true.
+matchTitle: true
+
+# Determines if we search the body (optional). Defaults to true.
+matchBody: true
+
+# Determines if label matching is case sensitive (optional). Defaults to true.
+caseSensitive: true
+
+# Explicit keyword mappings to labels. Form of match:label. Required.
+labelMappings:
+  "part:channels": "part:channels"
+  "part:docs": "part:docs"
+  "part:tests": "part:tests"
+  "part:tooling": "part:tooling"
+  "part:❓": "part:❓"
+  "version:0.1.x": "version:0.1.x"
+  "version:old": "version:old"
+  "version:❓": "version:❓"