Songpal code improvement

[shenxn]

Proposed change

• The songpal/set_sound_setting now uses service registration helper to register so the entity_id need to be set as all instead of left unset to call the service on all songpal devices.
• The integration now reaches gold quality scale.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logo's and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Songpal code and test improvement core#35318
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue:

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

[frenck]

Thanks for the PR @shenxn!

entity_id is optional for these service calls (one could target an area instead).

[frenck]

✅ Approved. Can be merged as soon as the parent PR gets merged.