* chore: only retry when retry-able
* chore: revert dbg change
* refactor: per review
* fix: check for available frontend first
* docs: more explain&longer timeout&feat: more retry at every level&try send select 1
* fix: use `sql` method for "SELECT 1"
* fix: also put recover flows in spawned task and a dead loop
* test: update transient error in flow rebuild test
* chore: sleep after sqlness sleep
* chore: add a warning
* chore: wait even more time after reboot
* feat: use flow batching engine
broken: try using logical plan
fix: use dummy catalog for logical plan
fix: insert plan exec&sqlness grpc addr
feat: use frontend instance in flownode in standalone
feat: flow type in metasrv&fix: flush flow out of sync& column name alias
tests: sqlness update
tests: sqlness flow rebuild udpate
chore: per review
refactor: keep chnl mgr
refactor: use catalog mgr for get table
tests: use valid sql
fix: add more check
refactor: put flow type determine to frontend
* chore: update proto
* chore: update proto to main branch
* fix: add locks for create/drop flow&docs: update docs
* feat: flush_flow flush all ranges now
* test: add align time window test
* docs: explain `nodeid` use in check task
* refactor: AddAutoColumnRewriter check for Projection
* refactor: per review
* fix: query without time window also clean dirty time window
* chore: better logging
* chore: add comments per review
* refactor: per review
* chore: per review
* chore: per review rename args
* refactor: per review partially
* chore: update docs
* chore: use better error variant
* chore: better error variant
* refactor: rename FlowWorkerManager to FlowStreamingEngine
* rename again
* refactor: per review
* chore: rebase after #5963 merged
* refactor: rename all flow_worker_manager occurs
* docs: rm resolved TODO
