fix: memory leak

enh: allow any user to create a topic

fix: dataDir process for multi-tier storage

fix: synchronize access of pWalHandle with mutex in raftLogGetEntry

fix: add redirect error code and fix no error msg issue

refact: remove redundant error codes

fix(sync): close snapshot receiver in pre-close

fix: walSaveMeta ahead of deleting WAL files as gc in walEndSnapshot

     delete WAL files in descending order during walRollback