enh: opt transport opt

fix: free thread save memory before set null

fix(query): set the correct rows in data block.

fix: refact client statistics collection

refactor: do some internal refactor and add some logs.

fix: not allow to read if sync is restoring

refactor: do some internal refactor and fix race condition.

fix:add limit for stream batch

enh: handle too many session

fix: memory leak of tfs

fix(tsdb/cache): use block index cache with last/last_row