Add getRecentPrioritizationFees RPC endpoint (backport #27278)

[mergify]

This is an automatic backport of pull request #27278 done by Mergify.
Cherry-pick of 9b8bed8 has failed:

On branch mergify/bp/v1.14/pr-27278
Your branch is up to date with 'origin/v1.14'.

You are currently cherry-picking commit 9b8bed86f.
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Changes to be committed:
	modified:   client/src/rpc_response.rs
	modified:   docs/src/developing/clients/jsonrpc-api.md

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   core/src/validator.rs
	both modified:   rpc/src/rpc.rs
	both modified:   rpc/src/rpc_service.rs
	deleted by us:   runtime/src/prioritization_fee_cache.rs

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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[CriesofCarrots]

I think this will go better if I wait until #29539 is merged. I'm also curious if the backport tag will work a 2nd time.

[CriesofCarrots]

I'm also curious if the backport tag will work a 2nd time.

It doesn't.