Add Accuracy to Google Location Sharing

[rdbahm]

Description:

Adds accuracy info provided by locationsharinglib to the data provided by this component.

Related issue (if applicable): N/A

Pull request in home-assistant.github.io with documentation (if applicable): N/A

Example entry for configuration.yaml (if applicable): No change required.

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

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

• [N/A] Documentation added/updated in home-assistant.github.io

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

• [N/A] New dependencies have been added to the REQUIREMENTS variable (example).
• [N/A] New dependencies are only imported inside functions that use them (example).
• [N/A] New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• [N/A] New files were added to .coveragerc.

If the code does not interact with devices:

• [N/A?] Tests have been added to verify that the new code works.