Add support for validator transactions

[heliuchuan]

Description

In release 1.10 a new transaction type 'validator_transaction' was added. This adds its corresponding response type. Fixed a few type bugs as well.

Example

{
   "version":"3",
   "hash":"0xc2f1a301b4af32c817f624f7b6edb778c5ec522e1e122b1b0d74472a10809cef",
   "state_change_hash":"0xf8699a3b0194c10eb0242fdeb9361deee8a3c242a21222e74df857c3c0ac1961",
   "event_root_hash":"0x0db7799c6ee25bc8ca2539ba4fb04f1c701c9bc929c97c54e7a12d584ade84a1",
   "state_checkpoint_hash":null,
   "gas_used":"0",
   "success":true,
   "vm_status":"Executed successfully",
   "accumulator_root_hash":"0xec3a5fa8a61310432a89b23549cea590a44e79afe9d232d241efb23a6f18592f",
   "changes":[
      {
         "address":"0x1",
         "state_key_hash":"0x50578ada6e87f43cf8693b904e291f9a4b45e3dd8ba76fd7a5b6cfe2b04db116",
         "data":[
            "Object"
         ],
         "type":"write_resource"
      },
      {
         "address":"0x1",
         "state_key_hash":"0x5c4285a5bcbfb079714ca24ba9c766305b3d1ae093da3bce6c5c32aaa7f6cac0",
         "data":[
            "Object"
         ],
         "type":"write_resource"
      }
   ],
   "events":[
      {
         "guid":[
            "Object"
         ],
         "sequence_number":"0",
         "type":"0x1::jwks::ObservedJWKsUpdated",
         "data":[
            "Object"
         ]
      }
   ],
   "timestamp":"1708575651139233",
   "type":"validator_transaction"
}

Test Plan

Added a static test against a sample JSON response to make sure the response satisfies the type.

Perhaps later make this a runtime check against 'live' data but then we'd have to write/generate our own runtime type check.

Note the user_transaction test doesn't pass because of the single sender API issues.

Related Links

[gregnazario]

Mostly comments around the commented out test, as well as why is the ? changed to | null?

[0xmaayan]

Overall lgtm. A comment around a new not working commented out test - a bit confused around it

Also, please update changelog. And fix lint