Made mostly stylistic changes.

Small grammar updates to the high availability and load balancing page within clusters.

Small grammar updates to cluster operations.

Small grammar changes to the Cluster Deployment page

Small grammar edits on Clustering page

There was an odd sentence in this doc, I updated it to reflect what is written in the Chinese version.

Grammar updates to Data Subscription page.

Grammar updates to the Continuous Query page

feat: create mnode

test: modify timestamp of saving consume result row

enh(stream): add error string

test: case for alter stable column

feat(tmq): use tdb as persistent storage

Grammar updates to Developer Guide > Select Data

Small grammar updates.

Some grammar updates to Inserting Data > SQL

Small grammar edits.

test： split udf test case for CI 

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

fix: some problems of parser

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