Draft: Add reading and packing/unpacking of ISM PI data, under define ISM_PI_DATA. (!2329) · Merge requests · IVAS Codec Public Collaboration / IVAS Codec · GitLab

Related issues: #1154
Requested reviewers: @pajunen, @ripinder.singh

Reason why this change is needed

Add support of ISM PI data

Description of the change

Add ISM PI data packing/unpacking into the C code and the Python test framwork.

Related to #1154