enh: refactor retry code

fix:window time wait

refactor(stream): distributed checkpoint

fix: get prevLogTerm of index zero as 0 only when firstVer is zero

* test: update taos-tools 63b1c71

* test: update taos-tools da2ee67

* test: update taos-tools 823fae5

enh: add topic privilege in mnode

fix(sync): delete duplicate code

opti: get meta in schemaless

refactor(sync): put heartbeat-reply msg into sync-ctrl-queue

feat: implement pipelining of sync

fix:stream crash && add debug log

fix: show Permission denied error in mac

Update 01-faq.md

enh: show leader ** if vnode can read and can't write

refactor(sync): delete code wait snapshot end in pre-close

Add FAQ 19: how to fix macOS Too many open files

refactor(sync): add traceId log