leaudio: Improve configuration and reconfiguration

With this patch after reconfiguration(e.g. when metadata changed),
group stays in the CONFIGURED state and does not go to STREAMING as
before. Instread Audio Hal gets suspended.
Group will go to streaming when Audio Hal tries to resume stream.

Also, with this patch, if ASEs are alread configured, state machine will
do QoS Config right away without trying to do Codec Config.

Bug: 222674521
Bug: 150670922
Test: atest --bluetooth_le_audio_test bluetoot_le_audio_client_test

Change-Id: Ibe771914f57732015d8dd57688cac84fee0cd296