In-Memory Engine: write path

[afeinberg]

Write path for the hybrid/in-memory engine

Parent issue: #16141

Atomic write support

• Design, proof-of-concept for atomic write
  See: master...afeinberg:tikv:afeinberg/memory_engine/atomic_write_poc
• In-memory engine: API changes for write-path. #16322

Write batch implementation

• In-memory engine: API changes for write-path. #16322
• Spike: Full Hybrid-Engine write-batch implementation WIP [DRAFT]: Hybrid Engine write-path  #16292
• Strategy around region-id WIP [DRAFT]: Hybrid Engine write-path  #16292 Pending re-factor to one skip list
• Implement and unit test WriteBatch interfaces In-Memory Engine: WriteBatch implementation. #16381
• Integrate HybridEngineWriteBatch, Skiplist In-Memory Engine: WriteBatch with Skiplist Engine #16433
• Spike: end-to-end branch able to run TPCC tests In-Memory Engine: Load from ranges from region labels #16753

Testing

• In-Memory Engine: Write-path Testing #16453
• Initial tpcc tests comparison: using in-memory engine, no in-memory engine. In-Memory Engine: Load from ranges from region labels #16753

Integration

• Spike: start tikv-server with HybridEngine WIP [DRAFT]: Hybrid Engine write-path  #16292
• End-to-end test for writing to hybrid-engine In-Memory Engine: WriteBatch with Skiplist Engine #16433

Loading

• In-Memory Engine: State collection and region eviction #16417

[afeinberg]

/assign @afeinberg