client/player: Add endpoint menu

client/player: Add endpoint menu

This adds endpoint menu:

[bluetooth]# menu endpoint
Menu endpoint:
Available commands:
-------------------
list [local]                                      List available endpoints
show <endpoint>                                   Endpoint information
register <UUID> <codec> [capabilities...]         Register Endpoint
unregister <UUID/object>                          Register Endpoint
config <endpoint> <local endpoint> [preset]       Configure Endpoint
presets <UUID> [default]                          List available presets

Signed-off-by: Manika Shrivastava <manika.sh@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>