Add device tracker to Subaru integration

[G-Two]

Proposed change

• Add device tracker platform to Subaru integration

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: N/A
• This PR is related to issue: N/A
• Link to documentation pull request: Add device tracker documentation to Subaru home-assistant.io#24345

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
• 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.

The integration reached or maintains the following Integration Quality Scale:

• No score or internal
• 🥈 Silver
• 🥇 Gold
• 🏆 Platinum

To help with the load of incoming pull requests:

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

[vondruska]

I know this has been hanging out for a while. The code looks good to me. Are there tests to be able to add or exclude it from coverage in .coveragerc?

[Lash-L]

Looks good to me!

I'll try to test this sometime tomorrow just so the core maintainers have another data point that it is functional. Would love to see this feature merged in. Thank you!

[gjohansson-ST]

Setting as draft until review comments has been addressed

[G-Two]

Comments have been addressed and branch rebased.

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[gjohansson-ST]

Looks finished to me besides I think you can add a test to bring coverage to 100%
Meaning test if latitude, longitude and timestamp is None

[gjohansson-ST]

LGTM 👍