Release Notes

from：release/ver-2.6.0.18 to：release/ver-2.6.0.22

FIX BUGS: fix:change the new interface name of schemaless (#17188) fix: change the size limit of sql stmt rebuilt for show create table to TSDB_MAX_SQL_LEN (#16767) fix: synchronize initialization and destruction of subqueries and their states (#16895) fix:double free (#16933) fix: aggregation error when one group rows exceed int16_max (#16911)

ENHANCEMENTS: fix: improve group by performance by skip sort when group by (#16913)