Add support for service translations

[frenck]

Proposed change

This PR adds basic support for the translations of services.

I've picked light to be the first one for this use case, as it is bigger and contains all permutations we need to support.

hassfest has been adjusted to both verify the translation schema, as well as the validation of the services, which takes the translations into account.

This PR also makes name of both the service and the service fields required.

TODO:

• Frontend
• Handling/structure for selector translations (e.g. values of a select selector).
• Backwards compatibility (for e.g, Node-Red, Appdaemon and others)
• Update developer documentation
• Write dev blog on the change

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request: Add developer documentation about translations for services developers.home-assistant#1835

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (light) you are listed as a code owner for? Thanks!

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[frenck]

Rebased to deal with a merge conflict (and more "name" cases in current dev should be solved).

[frenck]

Backwards compatibility also working now

(☝️ current PR with the frontend of the 2023.8.1 release)