client/player: Add support for Metadata in BAP Profile

client/player: Add support for Metadata in BAP Profile

This adds support for Metadata in BAP profile.
In order to register zero Metadata, 0 shall be
entered when prompted.

[bluetooth]# endpoint.register 00002bc9-0000-1000-8000-00805f9b34fb 0x06
[/local/endpoint/ep0] Enter Metadata (value/no): n
[/local/endpoint/ep0] Auto Accept (yes/no): y
[/local/endpoint/ep0] CIG (auto/value): a
[/local/endpoint/ep0] CIS (auto/value): a
Capabilities:
  03 01 ff 00 02 02 03 02 03 03 05 04 1e 00 f0 00  ................
Endpoint /local/endpoint/ep0 registered