Migrate NSW Rural Fire Service integration to async library

[exxamalte]

Breaking Change:

Description:

This migrates the NSW Rural Fire Service integration to an async library. Functionality and behaviour is exactly the same as before.

Next steps will be to make this a top-level integration and introduce config flow.

Related issue (if applicable): addresses #27284 as a side-effect

Pull request with documentation for home-assistant.io (if applicable): n/a

Example entry for configuration.yaml (if applicable):

geo_location:
  - platform: nsw_rural_fire_service_feed

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist

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

• The manifest file has all fields filled out correctly. Update and include derived files by running python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt by running python3 -m script.gen_requirements_all.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[MartinHjelmare]

Looks great!

[MartinHjelmare]

Nice!