RootCanal: Provide skeleton implementation for the LE APCF vendor command

- add the android vendor setting to the proto configuration to
  enable android vendor commands
- add the flag supports_le_apcf_vendor_command to controller properties
- match the APCF Opcode and dispatch to subcommand handlers in
  link layer controller

Bug: 296143555
Test: m root-canal
Change-Id: I09206ffd3295f778e433e9678adde5d0ec30a50f