fix: update schema version when modify column width of normal table

fix: set timestamp precision of query in tscCreateQueryFromQueryInfo

fix(query): fix issues found by Coverity Scan in qExecutor.c in 2.4

fix: update parallel_test/cases.task

fix(rpc): add debug log

enh: guard against possible nullptrs of subquery objs in SSqlObj pSubs additionally

fix: change the size limit of sql stmt rebuilt for show create table to TSDB_MAX_SQL_LEN

fix: synchronize initialization, access, and destruction of subqueries and their states

     2. access pSql->subState.numOfSub in the same way

enh: initialize and destroy pSubs and their states with doReInitSubState and tscFreeSubobj/freeJoinSubqueryObj

     2. protect destruction of pSubs etc within tscFreeSubobj with subState.mutex

Tomchon patch 3

fix: syntax error when no fields in line

fix: filter unit is keeped when values and nulls exist in same block