Store runtime data inside the config entry in Radio Browser

[mib1185]

Proposed change

SSIA

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)
• [x] 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:

Checklist

• [x] The code change is tested and works locally.
• [x] Local tests pass. Your PR cannot be merged unless tests pass
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• [ ] Tests have been added to verify that the new code works.

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

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• [ ] The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
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  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.

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[home-assistant[bot]]

Hey there @frenck, mind taking a look at this pull request as it has been labeled with an integration (radio_browser) you are listed as a code owner for? Thanks!

Code owner commands

Code owners of `radio_browser` can trigger bot actions by commenting: - `@home-assistant close` Closes the pull request. - `@home-assistant rename Awesome new title` Renames the pull request. - `@home-assistant reopen` Reopen the pull request. - `@home-assistant unassign radio_browser` Removes the current integration label and assignees on the pull request, add the integration domain after the command. - `@home-assistant add-label needs-more-information` Add a label (needs-more-information, problem in dependency, problem in custom component) to the pull request. - `@home-assistant remove-label needs-more-information` Remove a label (needs-more-information, problem in dependency, problem in custom component) on the pull request.

[mib1185]

mehhh ... there were no tests for media_source.py before, but adding it to .coveragerc is declined by hassfest 🙄

hassfest.................................................................Failed
- hook id: hassfest
- exit code: 1
[...]
Integrations: 1261
Invalid integrations: 1

Found errors. Generating files canceled.

Integration radio_browser:
* [ERROR] [COVERAGE] media_source.py must not be ignored by the .coveragerc file