feat: flow perf&fix df func call (#4347)

* feat: flow perf&fix df func call

feat: make source sender `send` non-blocking

feat: better control of flow worker freq

feat: support transform interval

fix: const folding df func args&tests

tests: update cast const fold

chore: adjust flow work's freq

refactor: batch split

feat: adaptive run freq flow worker&check for errors

chore: better debug log

* refactor: per review

* chore: per zc's review

* chore: per bot review

* chore: remove some `TODO` completed

* docs: add comments for a test

src/operator/src/insert.rs

@@ -358,7 +358,6 @@ impl Inserter {
                 // already know this is not source table
                 Some(None) => continue,
                 _ => {
-                    // TODO(discord9): query metasrv for actual peer address
                     let peers = self
                         .table_flownode_set_cache
                         .get(table_id)