feat: RPC for returning scale-encoded System events

[syan095]

Pull Request

Closes: PRO-1185

Checklist

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

• I am confident that the code works.
• I have updated documentation where appropriate.

Summary:

Created a RPC call that returns System events (In EventRecord) scale encoded.
Changed the original get_events rpc to return event records instead of just the Raw events

[syan095]

The returned data is Vec<frame_system::Event> in scale-encoded bytes format (hex encoded).
{"jsonrpc":"2.0","result":["5c00c255053000020000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c000000824bf665798c0000"],"id":1}%

It does not include extra information in the EventRecord. Let me know if we want to include the event record as well, I can change this.

[codecov]

Codecov Report

Attention: Patch coverage is 5.55556% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 72%. Comparing base (88d68d3) to head (af62c05).
Report is 9 commits behind head on main.

Files	Patch %	Lines
state-chain/custom-rpc/src/lib.rs	0%	18 Missing ⚠️
state-chain/runtime/src/lib.rs	0%	0 Missing and 13 partials ⚠️
state-chain/runtime/src/runtime_apis.rs	40%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #4638   +/-   ##
=====================================
- Coverage     72%     72%   -0%     
=====================================
  Files        414     414           
  Lines      68288   68312   +24     
  Branches   68288   68312   +24     
=====================================
+ Hits       49046   49056   +10     
- Misses     16852   16855    +3     
- Partials    2390    2401   +11     

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[dandanlen]

Pretty sure we need the EventRecord here too. This is what allows us to correlate the event (for example ExtrinsicSuccess) with the extrinsic that triggered it.

[syan095]

Pretty sure we need the EventRecord here too. This is what allows us to correlate the event (for example ExtrinsicSuccess) with the extrinsic that triggered it.

Done.
I took the chance to change the get_events rpc call to return EventRecord as well.

[dandanlen]

Just one comment 👌