Add services to geniushub

[zxdavb]

Breaking Change:

Known none.

Description:

Add services to geniushub: these expose the full functionality of the system, using geniushub's own schema:

• set_zone_mode: set teh zone mode (e.g. footprint mode)
• set_zone_override: set the zone to target temp for a period of time

Related issue (if applicable): N/A

Pull request with documentation for home-assistant.io (if applicable): home-assistant/home-assistant.io#11798

Example entry for configuration.yaml (if applicable): unchanged

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 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:

• 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.
• Untested files have been added to .coveragerc.