Shared HLS cache session feature and aligns the runtime, cache, provisioning, recovery, custom-response, and documentation paths with the new shared-session model.
* Optimized build
* timeout secs for custom video response
* init custom video timeout on mode switch
* terminate immediately when custom video buffer is missing
* add provisioning missing-custom timeout regression test
* add missing-custom termination tests for all custom modes
* fix ts continuity handling for discontinuity and adaptation-only packets
* fix ts loop duration estimation to use min/max timestamps
* harden pes timestamp patching and normalize pid cc sequence
* Resource ffmpeg creation without B-Frames and short GOPs
* Discontinuity patch for transport stream buffer
* grace hold stream is now default true
* streaming fixes
