getLeaderSchedule now supports filtered results based on validator identity (backport #16723)

[mergify]

This is an automatic backport of pull request #16723 done by Mergify.

Cherry-pick of 6004c0a has failed:

On branch mergify/bp/v1.6/pr-16723
Your branch is up to date with 'origin/v1.6'.

You are currently cherry-picking commit 6004c0abf.
  (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:   client/src/rpc_config.rs
	modified:   client/src/rpc_response.rs
	modified:   core/src/rpc.rs
	modified:   docs/src/developing/clients/jsonrpc-api.md
	modified:   validator/src/main.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   client/src/rpc_client.rs

To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

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[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #16731 (c73a7b2) into v1.6 (e51d7af) will increase coverage by 0.0%.
The diff coverage is 82.0%.

@@           Coverage Diff           @@
##             v1.6   #16731   +/-   ##
=======================================
  Coverage    82.9%    82.9%           
=======================================
  Files         414      414           
  Lines      113979   114013   +34     
=======================================
+ Hits        94520    94553   +33     
- Misses      19459    19460    +1