Fix Sonos join/unjoin in scripts

[amelchio]

Description:

Since #12126 the Sonos platform has relied exclusively on push events to determine the grouping of players. That is very clean and works perfectly ... in theory.

In practice, we have scripts that modify a group and start using a single speaker before any event tells us that it is now detached.

This PR sacrifices a bit of the cleanliness because actually working is also nice. We now update the group topology by hand when issuing group modifications. This happens under the existing topology_lock so we never construct any partial groups.

The event handler is still needed because external controllers might also be modifying groups.

Example entry for configuration.yaml (if applicable):

script:
  sonos_say:
    sequence:
      - service: media_player.sonos_snapshot
        data_template:
          entity_id: "{{ sonos_entity }}"
      - service: media_player.sonos_unjoin
        data_template:
          entity_id: "{{ sonos_entity }}"
      - service: tts.google_say
        data_template:
          entity_id: "{{ sonos_entity }}"
          message: "{{ message }}"
      - service: media_player.sonos_restore
        data_template:
          entity_id: "{{ sonos_entity }}"

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox.

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 dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.