This ticket tracks the process of supporting DROP TABLE caluse.

Tasks:

• add deregister_table() and implement it for MemoryCatalogManager feat: deregister table for MemoryCatalogManager #620
• DROP TABLE in standalone mode
  • using MemoryCatalogManager feat: impl DROP TABLE on memory catalog based standalone mode #630
  • using local catalog feat: local catalog drop table #913
• DROP TABLE in distributed mode feat: implement "drop table" in distributed mode (both in SQL and gRPC) #944
• drop route in meta service feat: move_value & delete_route #707
• Background resource GC task Implement drop_region() for StorageEngine #1556