rpc: Add caching support (backport #9650)

[mergify]

This is an automatic backport of pull request #9650 done by Mergify.
Cherry-pick of 816c6ba has failed:

On branch mergify/bp/v0.37.x/pr-9650
Your branch is up to date with 'origin/v0.37.x'.

You are currently cherry-picking commit 816c6bac0.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   light/proxy/routes.go
	modified:   rpc/core/routes.go
	modified:   rpc/jsonrpc/jsonrpc_test.go
	modified:   rpc/jsonrpc/server/http_json_handler.go
	modified:   rpc/jsonrpc/server/http_json_handler_test.go
	modified:   rpc/jsonrpc/server/http_server.go
	modified:   rpc/jsonrpc/server/http_server_test.go
	modified:   rpc/jsonrpc/server/http_uri_handler.go
	modified:   rpc/jsonrpc/server/rpc_func.go
	modified:   rpc/openapi/openapi.yaml

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   CHANGELOG_PENDING.md
	deleted by us:   test/fuzz/tests/rpc_jsonrpc_server_test.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[sergio-mena]

LGTM

[thanethomson]

@sergio-mena would you recommend holding off on merging this until v0.37.1?

[sergio-mena]

I would say so

[faddat]

this is a big deal. Thanks team.