Release v2.2.2

🚀 New Features

• Watch Key feature support watch event by key #227 @Jeremy-Run

🎄 Enhancements

• Batch Optimiztion use sync.Pool to optimize db.Put operation #235
• Optimize memory usage enhancement: high memory usage of rosedb #236

🎠 Community

• Thanks to @kebukeYi
  • Change Variable name in openMergeDB (#228)
  • Avoid parsing wal files repeatedly. (#229)
• Thanks to @Jeremy-Run
  • Deleted data cannot exist in the index (#232)
  • fix: solve data race (#234)
  • fix: destFile may be not exist (#243)
• Thanks to @rfyiamcool
  • fix: format code comment for rand_kv (#240)