research-v8.0.0 anchor.

Includes the following since the previous anchor:

Candidate Tools
---------------
- CWG-E099: Further simplify and unify the DRL and the WRL
- CWG_E084: Context model optimization
- CWG-E098: Optimize the signaling of TIP direct output mode
- CWG-E107: Enlarge max inter sdp block size to 64x64
- CWG-E112: Supports compound prediction for additional blocks
- CWG-E105: Improvements/fixes in CCTX, TX partition type in WAIP, and REFINEMV
- CWG-E109: Transform type flexibility improvements
- CWG-E134: Improvements of RefMV Bank and Warp Parameter Bank
- CWG-E106: Data-Driven Transforms for Inter Coding
- CWG-E108: Fixing line-buffer and division operation issues in the CfL mode
- CWG-E133: Simplification of Skip Mode
- CWG-E122: Enabling Intra-BC for natural content
- CWG-E136: Reducing the number of partition contexts
- CWG-E132: Further Memory Reduction for Intra Bi-Prediction (overrides previous
  proposal CWG-E094)
- CWG-E139: Improved TMVP motion vector from wedge mode blocks
- CWG-E110: Pixel-Classified Explicitly Signaled Frame-Level Non-separable
  Wiener Filters
- CWG-E115: Simplified motion trajectory tracking
- CWG-E141: Unrestricted Partitioning for 1:4 Coding Blocks
- CWG-E005: Coefficient coding improvements (Part2)
- CWG-E125: Simplifications for MHCCP
- CWG-E123: Refinements for Probability Adjustment Rate Adaptation (PARA) in
  Entropy Coding

Encoder-only Changes
--------------------
- CWG-E104: Encoder mode/transform search optimizations
- CWG-E137: Encoder optimizations at speed 0 and 1
- CWG-E135: Encoder speed up using ML-based Partition Pruning, inter frames

Code Cleanups / Improvements
----------------------------
- TFLite: Bump up version to 2.17 and enable XNNPack
- CWG-E148 Research v8.0.0 anchor: Removal and Merging of Compile Time Flags

Gitlab CI Updates
-----------------
- Gitlab CI: add build check for 2 tools that are off by default.

Bugfixes
--------
https://gitlab.com/AOMediaCodec/avm/-/milestones/10#tab-issues