enh: shielding sql command 'alter database strict'

fix: fix taosd crash caused by assert

merge from 3.0.2.0 to main

fix(query): does not return error code if queried table does not exists.

fix: control rpc qitem memory

fix: show queries crash issue

fix(query): return with error code if the table does not exist

release/ver-3.0.2.0

fix(query): keep the correct value.

fix(query): remove invalid assert and fix the error in memcpy data.

fix: donot print log while assert

fix: shell crash TD-21115

release: build 3.0.2.0

fix(query): remove invalid assert and fix the error in memcpy data.

fix:fix mem leak

fix: shell crash TD-21115

fix: donot print log while assert