enh: force drop dnode

enh: return mem to os

fix(planner):add semantic check

refactor(sync): add sync local cmd, step down

fix(query): set correct error code.

ehn(query): keep the time window for each block to avoid repeatly parsing the compressed data block meta info.

refactor: do some internal refactor.

enh: add sql command 'drop dnode id force'

enh: set sst trigger default value from 8 to 1

fix: rm log