feat: cf_events_dynamic rpc

[dandanlen]

Pull Request

Next step in PRO-1246

This adds a cf_dynamic_events rpc to the node.

The rpc call returns json-encoded events (see #4889).

To test it out, run a localnet and use curl:

curl 'http://localhost:9944/' \
  -H 'accept: application/json' \
  -H 'content-type: application/json' \
  --data-raw '{"jsonrpc":"2.0","method":"cf_dynamic_events","params":[],"id":1}' | jq

Gives (for example):

{
  "jsonrpc": "2.0",
  "result": [
    {
      "event": {
        "System": {
          "ExtrinsicSuccess": {
            "dispatch_info": {
              "class": "Mandatory",
              "pays_fee": "Yes",
              "weight": {
                "proof_size": "0x0",
                "ref_time": "0xc015570"
              }
            }
          }
        }
      },
      "phase": {
        "ApplyExtrinsic": 0
      },
      "topics": []
    },
    {
      "event": {
        "PolkadotChainTracking": {
          "ChainStateUpdated": {
            "new_chain_state": {
              "block_height": 83,
              "tracked_data": {
                "median_tip": "0x0",
                "runtime_version": {
                  "spec_version": 10000,
                  "transaction_version": 25
                }
              }
            }
          }
        }
      },
      "phase": {
        "ApplyExtrinsic": 1
      },
      "topics": []
    },
    {
      "event": {
        "Witnesser": {
          "CallDispatched": {
            "call_hash": "0xaec0e769dc26b0e062f88f1cbe6a30e13452375ac740565cdeb9b2cde9e65e88"
          }
        }
      },
      "phase": {
        "ApplyExtrinsic": 1
      },
      "topics": []
    },
    // ...
  ]
}

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 74 lines in your changes missing coverage. Please review.

Project coverage is 71%. Comparing base (73b2773) to head (4334afb).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
state-chain/custom-rpc/src/dynamic_events.rs	0%	55 Missing ⚠️
state-chain/node/src/service.rs	0%	12 Missing ⚠️
state-chain/custom-rpc/src/lib.rs	0%	6 Missing ⚠️
utilities/src/with_std/dynamic_events.rs	0%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##            main   #4905    +/-   ##
======================================
- Coverage     71%     71%    -0%     
======================================
  Files        490     491     +1     
  Lines      85156   85136    -20     
  Branches   85156   85136    -20     
======================================
- Hits       60608   60467   -141     
- Misses     21843   21955   +112     
- Partials    2705    2714     +9     

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