Move bluetooth remote scanner implementation into a base class

[bdraco]

Proposed change

Move remote bluetooth remote scanner implementation into a base class and
add test coverage for it.

• The same implementation can be reused for other remotes such as shelly in Add shelly ble scanner support #82007

In a future PR models.py will be split into multiple files after
home-assistant-libs/home-assistant-bluetooth#10

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• Dependency upgrade
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• 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

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• This PR fixes or closes issue: fixes #
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[home-assistant]

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

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[bdraco]

I think this will be easier to manage if we move it into base_scanner.py

[bdraco]

home-assistant-libs/home-assistant-bluetooth#10 is needed first before we can split up this file to avoid a circular import

[bdraco]

I'll write the test in test_models.py and we can rearrange it in another PR after home-assistant-libs/home-assistant-bluetooth#10 merges and is bumped

[bdraco]

Retested with esphome and the new shelly scanner 👍

[bdraco]

Thanks.