Add more configuration options for the Harman Kardon AVR component

[Devqon]

Description:

This allows the user to:

• Configure the input sources of the AVR
• Configure a key interval to sleep between the sending of the key commands
• Simulate the volume setter of the AVR (This enables to control the volume through Google Assistant)

Pull request in home-assistant.io with documentation (if applicable): home-assistant/home-assistant.io#9254

Example entry for configuration.yaml (if applicable):

media_player:
  - platform: harman_kardon_avr
    host: IP_HERE
    key_interval: 0.3
    simulate_volume_set: True
    sources:
      - source: TV
        name: Television
      - source: Game
        name: Xbox One

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:

• The manifest file has all fields filled out correctly (example).
• New dependencies have been added to requirements in the manifest (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.

Note: There was a previous pull request, but I cannot re-open it: #23162

[codecov]

Codecov Report

Merging #23569 into dev will increase coverage by 0.36%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev   #23569      +/-   ##
==========================================
+ Coverage   93.83%    94.2%   +0.36%     
==========================================
  Files         462      453       -9     
  Lines       37686    36913     -773     
==========================================
- Hits        35363    34773     -590     
+ Misses       2323     2140     -183

Impacted Files	Coverage Δ
homeassistant/components/mqtt/fan.py	74.19% <0%> (-23.78%)	⬇️
homeassistant/components/zha/core/registries.py	85% <0%> (-1.96%)	⬇️
homeassistant/components/hue/bridge.py	73.07% <0%> (-1%)	⬇️
homeassistant/components/zha/binary_sensor.py	92.3% <0%> (-0.97%)	⬇️
homeassistant/components/zha/core/discovery.py	92.1% <0%> (-0.76%)	⬇️
homeassistant/components/local_file/camera.py	95.91% <0%> (-0.58%)	⬇️
homeassistant/components/axis/binary_sensor.py	72.22% <0%> (-0.51%)	⬇️
homeassistant/components/hassio/auth.py	90.47% <0%> (-0.44%)	⬇️
homeassistant/helpers/service.py	91.58% <0%> (-0.4%)	⬇️
setup.py	86.41% <0%> (-0.25%)	⬇️
... and 48 more

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[balloob]

We should not allow overriding the sources via the config. What is wrong with the options that come from the API?

[balloob]

We shouldn't add this.

[balloob]

I don't see a use for this either, and it's only used for the fake volume? We should drop it.

[balloob]

I don't think that each of the three features this PR aims to add belong in Home Assistant.