Release Notes

from：release/ver-2.6.0.1 to：release/ver-2.6.0.4

FIX BUGS: TDengine fix: remove some case-insensitive checkings (#13664) fix: pSql->subStates maybe free by recreate (#13614) fix: inserting data from multi files is not supported (#13522) fix: schemaless support blank comma equal sign mark (#13409) fix: batch create table bug (#13385) fix: mixed operator output num calc error (#13293) fix: line protocol support n and fixed error (#13301) fix: delete empty super table core (#13328)