bluetooth: tester: bap: Add support for BAP/USR tests

Extend Codec capabilities of the server.

At Codec Config operation initiated autonomously by server, all ASEs
with lower IDs than the requested one have to be initated first due
to API limitation.

In some BAP/USR (server role) test cases the PTS sends the MMI 202
to configure the Sink ASE to streaming state, in some others it does not.
For now, let's autonomously send Receiver Start Ready at ASE Enabled.

Signed-off-by: Magdalena Kasenberg <magdalena.kasenberg@codecoup.pl>