Migrate gpslogger to the automatically generated webhook

[rohankapoorcom]

Description:

Migrate GPSLogger over to the webhook component so that it doesn't need an API password or a long lived access token

Breaking Change:
Each instance of Home Assistant will now generate it's own unique webhook for GPSLogger to use. One will need to be generated and provided to the mobile app to the replace the existing url: https://myhome.duckdns.org/api/gpslogger?api_password=HA_PASSWORD. Home Assistant only supports using POST (no longer GET) for GPSLogger. The long lived access token is also no longer needed.

Related issue (if applicable): related to #15376

Pull request in home-assistant.io with documentation (if applicable): home-assistant/home-assistant.io#8186

I will create a docs PR once this previous PR is merged home-assistant/home-assistant.io#8152

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.

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

• Documentation added/updated in home-assistant.io

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

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

If the code does not interact with devices:

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

[balloob]

Ok to merge when docs added.

[rohankapoorcom]

Docs added and linked.

[rohankapoorcom]

@balloob this needs the breaking change label.