feat: add solana monitoring data

[marcellorigotti]

Pull Request

Closes: PRO-1658

Checklist

Please conduct a thorough self-review before opening the PR.

• I am confident that the code works.
• I have written sufficient tests.
• I have written and tested required migrations.
• I have updated documentation where appropriate.

Summary

Add solana monitoring data to monitoring rpc:

• Available nonces/Unavailable nonces
• Broadcaster.incomingKeyAndBroadcastId() -> This is missing for all the chains
  • Plus the signature of the transaction for solana -> we need to check it didn't revert
• Solana aggKey
• SolanaBroadcaster.currentOnChainKey -> Sol funds held here

[codecov]

Codecov Report

Attention: Patch coverage is 10.25641% with 35 lines in your changes missing coverage. Please review.

Project coverage is 70%. Comparing base (bd4cfa1) to head (f58a07e).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
state-chain/runtime/src/lib.rs	0%	0 Missing and 29 partials ⚠️
state-chain/custom-rpc/src/lib.rs	0%	4 Missing ⚠️
state-chain/runtime/src/monitoring_apis.rs	67%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##            main   #5277    +/-   ##
======================================
- Coverage     70%     70%    -0%     
======================================
  Files        487     487            
  Lines      86796   86697    -99     
  Branches   86796   86697    -99     
======================================
- Hits       60807   60608   -199     
- Misses     22655   22720    +65     
- Partials    3334    3369    +35     

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[dandanlen]

Looks fine to me, i'd just like to understand better how this will be used. Let's chat tomorrow.

[marcellorigotti]

Looks fine to me, i'd just like to understand better how this will be used. Let's chat tomorrow.

These changes are also breaking, bringing the same problems as #5279 does, correct?