Avoid route request penetration into CeresMeta

[ShiKaiWi]

Describe This Problem

Current route request implementation is just forwarding the request to CeresMeta, which is very dangerous to CeresMeta when massive route requests are received.

Proposal

Add a cache for route requests, which should be refreshed periodically. With the cache, the route requests from the client won't be forwarded to CeresMeta.

Additional Context

No response