docs(connector-rust): update documents of connector for rust

fix: join push down condition issue

The connector for rust has been updated to use `deadpool` as default connection pool instead of `r2d2`, and the `r2d2` was only kept for blocking mode.

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

fix: fix linear interpolation error

refactor: do some internal refactor.