Release v2.0.0

[roseduan]

🚀 New Features

• Change the architecture of LotusDB
  • Use wal project to store Write-Ahead-Log and Value-Log
  • Hash key into different indexes and value log files
  • Index and Vlog read/write will be concurrent
• Basic Put/Get/Delete/Exist operations
• Batch Put/Delete operations
• Value log compaction

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This discussion was created from the release Release v2.0.0.

[prr123]

congratulations!
tested code