fix(query): fix bug in group by tag.

fix: problem when last is used for system table query

fix(stream): coverity scan,type conversion

fix: error handling

test:add test case of alter database param buffer and pages

test: reopen taosShell.py test case

* docs: update examples/python/tmq_example.py with connector repo

* Update tmq_example.py

* docs: remove tb variable after get_table_name removed
Co-authored-by: NLiu Jicong <liujicong@qq.com>

fix: coverity scan problem

fix: enhance subroutines to resolve WAL inconsistency after crashing or disk full

test: add coverage test script

fix(query): fix coverity issues.

* fix: taosbenchmark coverity scan issues

* fix: taosbenchmark default json case

* fix: update taos-tools 217a267

* fix: taosbenchmark coverity scan issues 2849aa4

    * search for the last entry in the contiguous range of valid WAL from the last pos fsynced as firstTrial
    * find the last entry before the last pos fsynced backwards as second trial
    * reserve sufficient space for computing CRC32 checksum, esp. of WAL record body
    * rebuild meta info to resolve potential misalignment between lists of meta and actual log files
    * retract commitIndex and appliedIndex to lastLogIndex if needed
    * put an upper size limit on possibly corrupted WAL range to be recovered

* fix: taosbenchmark coverity scan issues

* fix: taosbenchmark default json case

* fix: update taos-tools 217a267

fix(tsdb): checksum checking shall skip page 1 when loading

fix: dismiss some coverity scan issues