fix: avoid memory leak

refactor: sync integrate into mnode

docs: stylistic and phrasing changes

Seems like previous PR was overwritten and reverted to original.

enh: add debug log of tsdb load block data cols

Merge branch 'feature/sync-mnode-integration' of https://github.com/taosdata/TDengine into feature/sync-mnode-integration

fix: follower processes the trans but does not send the action msg

fix: avoid multi thread read/write crash

feat:add json function

feat: scheduler refactor

fix: commit log should not be null

feat(tmq): serializer and deserializer for tq exec