refactor: use new protocol for remote engine service write

[ShiKaiWi]

Rationale

According to the cpu profile results, it costs too much cpu resource when encode/decode the payloads for the remote engine write service.

Detailed Changes

• Impose a new protocol for communication between remote engine client and service
• Avoid attaching the schema information in the payload
• Do the encoding work outside the io thread pool

Test Plan

Proved 60% traffic drop and 25% cpu performance improvement in one of our prod environment.

[jiacai2050]

LGTM