🔧✨ update to using auth headers. Bolt in optional commenter stub container

This MR:

• Adds a new commenter container in the docker compose rig (commented out) to enable local testing/validation
• Updates appservice calls to use the v3 endpoints of the matrix client api
• Adjusts calls to use auth header vs query params in tests
• Adjusts the log configuration for synapse to be much less noisy
• container version bumps
  • Update synapse container to v1.112.0
  • Update element-web container to v1.11.73

all tests are passing. LMK if you'd like to see anything else done here.