Pandora: Add bindings for VCP profile tests

- Import the ICS from the publicly available google
  device specification
- Implement VCPProxy with VCP interactions
- Implement barebone le_audio pandora_experimental
  interface and server support

Bug: 291996279
Test: atest pts-bot:VCP
Change-Id: I7a29ac4591222623ff66a635747b6e23013b670b