[split-non-be] ISAR bitstream format update

• Related issues:
• Requested reviewers: @tyagiri

Reason why this change is needed

• Minimizes number of unused bits in split rendering bitstream when LC3plus is in use
• Fixes broken 10ms framing

Description of the change

1. Uses the official RTP payload format instead of raw frames for the LC3plus bit stream (required for 2 below)
2. Re-uses unused pose correction bits for coding audio with LC3plus
3. Adds more fields to ISAR bitstream file header:

• LC3plus HIRES flag, coding sample rate - required to open LC3plus decoder before decoding first frame
• ISAR frame size - fixes 10ms framing in ISAR

Affected operating points

Split rendering bitstream for LC3plus configs.