Add fields/message for remote pipeline trigger

[synesthesiam]

What does this implement/fix?

Adds a new message VoiceAssistantTriggerPipeline and some fields to VoiceAssistantRequest to support remote pipeline triggering from Home Assistant.

This will allow HA to trigger a pipeline run on the ESPHome satellite from start_stage to end_stage with specific inputs:

• When start/end stages are both TTS, announce_text is the text to speak

Also adds:

• VoiceAssistantSetConfiguration - set active wake words
• VoiceAssistantConfiguration - lists available wake words

Types of changes

• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Other

Related issue or feature (if applicable): fixes

Pull request in esphome-docs with documentation (if applicable): esphome/esphome-docs#<esphome-docs PR number goes here>

Test Environment

• [ ] ESP32
• [ ] ESP32 IDF
• [ ] ESP8266
• [ ] RP2040
• [ ] BK72xx
• [ ] RTL87xx

Example entry for config.yaml:

# Example config.yaml

Checklist:

• [ ] The code change is tested and works locally.
• [ ] Tests have been added to verify that the new code works (under tests/ folder).

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

• [ ] Documentation added/updated in esphome-docs.

[probot-esphome[bot]]

Hey there @jesserockz, mind taking a look at this pull request as it has been labeled with an integration (voice_assistant) you are listed as a code owner for? Thanks! _{^{(message by CodeOwnersMention)}}

[probot-esphome[bot]]

Hey there @ottowinter, mind taking a look at this pull request as it has been labeled with an integration (api) you are listed as a code owner for? Thanks! _{^{(message by CodeOwnersMention)}}

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 53.95%. Comparing base (4d8b5ed) to head (85cd506). Report is 1215 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #7355      +/-   ##
==========================================
+ Coverage   53.70%   53.95%   +0.24%     
==========================================
  Files          50       50              
  Lines        9408     9668     +260     
  Branches     1654     1707      +53     
==========================================
+ Hits         5053     5216     +163     
- Misses       4056     4128      +72     
- Partials      299      324      +25     

:umbrella: View full report in Codecov by Sentry.
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[synesthesiam]

Closing in favor of a simpler design with just announce