fix:core dump in tsdbreader is null when tsdbreader is closed by subscribe msg and current offset equal to saved

fix(stream):extract delete msg from wal.

Enh/tsbs perf.4

fix(stream): add some logs and set the wal offset to be the ended version when finishing the step2 recover stage.

fix:add lock to pHandle for safety

fix: ignore crash signals in dmLogCrash