enh(query): return open/total cost for each operator.

fix(tmq): unref topic

fix: szBuf leak

fix(os): fix package client error

test: add cases for tmq

test: add test cases for trans

Made some grammar and reworded the differences between connectors.

Made grammar changes to the Data Model page.

docs: remove useful parts in 3.0 doc

docs: remove broken link

 fix: avoid memory leak in mnode sync

test: add test cases of tmq

fix: avoid memory leak in mnode sync

fix(query): set the correct schema version for each record in buffer.

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