Feature/3 liaohj

enh: convert the month and year in interval-offset to a database precision duration

fix: error in optimizing useless columns for multi-level set operators

fix(tmq): build sync api on top of async APIs.

fix: task context not exists issue

fix:[TS-3038] coredump if nchar data not clear SColVal in schemaless

opti:disable set enable.heartbeat.background

fix:int64 parse error in schemaless

fix:state window return wrong block type

fix(query): fix group_key is processed in selectivity twice