chore: add issue templates (#402)

.github/ISSUE_TEMPLATE/1-bug.yml

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+name: Bug Report
+description: Report a bug
+title: "[BUG] <title>"
+labels: [ "bug" ]
+body:
+  - type: dropdown
+    id: platform
+    attributes:
+      label: Platforms
+      description: On what platforms does the bug happen?
+      options: [ "all", "android", "iOS", "web" ]
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: Version of flutter maplibre_gl
+      description: What version of maplibre_gl are you using? (e.g. `0.18` or `master branch`)
+    validations:
+      required: true
+  - type: textarea
+    id: details
+    attributes:
+      label: Bug Description
+      description: Please give a quick description about the bug want to report.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Steps to Reproduce
+      description: Please list the steps required to reproduce the problem one by one.
+      placeholder: |
+        1. ...
+        2. ...
+        3. ...
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Expected Results
+      description: Please describe what is expected to happen.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Actual Results
+      description: Please describe what is actually happening. You can add logs, screenshots or videos.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Code Sample
+      description: |
+        Please paste the code of how you use the package below between the lines with the backticks.
+        
+        Note: Please do not upload screenshots of code. Instead, use code blocks
+        or share a link to a GitHub Gist or Repository.
+      value: |
+        ```dart
+        // Paste your code here
+        ```
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/2-feature.yml

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+name: Feature Request
+description: Suggest a Feature
+title: "[FEATURE] <title>"
+labels: [ "enhancement" ]
+body:
+  - type: textarea
+    id: details
+    attributes:
+      label: Feature Description
+      description: Please describe the feature you have in mind.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Describe alternatives you've considered
+      description: A clear and concise description of any alternative solutions or features you've considered.
+    validations:
+      required: false
+  - type: textarea
+    id: media
+    attributes:
+      label: Additional context
+      description: Add any other context or screenshots about the feature request here.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: "Q&A - GitHub Discussions"
+    url: https://github.com/maplibre/maplibre-native/discussions/categories/q-a
+    about: "If you have a question about using MapLibre on Flutter"
+  - name: "Join on Slack"
+    url: https://slack.openstreetmap.us/
+    about: "Join #maplibre-flutter on the OpenStreetMap Slack"