fix(query): check null ptr before dereferencing it.

enh: enable timeout checking of sync Resp with ttl as 30s

feat: add stream option 'delete_mark'

test: add cases for create and drop topic

enh: allow any user to create a topic

fix: dataDir process for multi-tier storage

fix: synchronize access of pWalHandle with mutex in raftLogGetEntry

fix: add redirect error code and fix no error msg issue

refact: remove redundant error codes

fix(sync): close snapshot receiver in pre-close

fix: walSaveMeta ahead of deleting WAL files as gc in walEndSnapshot

     delete WAL files in descending order during walRollback

* fix: csharp test case

* fix: return -1 if failed

fix:stddev\fisrt\last combine function

fix(log): ignore create log error

fix(shell): forbid .taos_history record password for security

refactor(sync): modify/use default config value