Test/test execution http rpc

[18aaddy]

Solves #87

• Tested http_rpc_test.go locally and made modifications according to it in some files.
• Tests working locally (other than CreateAccessList() function, which is not working, I'll raise an issue for that)

Summary of changes:

• Most changes have been made in functions in http_rpc.go as the rpc data that is being sent and received is in form of hex strings. So changes had to be made in the way data was sent and also some structs for receiving data
• I have updates the Transaction struct in common/types.go as otherwise, the data was not being unmarshaled. Due to this, I had to update few lines in consensus/consensus.go. I have tested the consensus part after this change and it works.
• Also I had to change the execution/rpc.go file so that the ExecutionRpc interface is satisfied by HttpRpc

More explanation can be found in comments above the changes
Also the lines of code are increased because of go.mod and go.sum

[gerceboss]

@18aaddy , can you pass the checks first?

Error: execution/execution.go:34:11: invalid operation: cannot indirect r (variable of type ExecutionRpc)
Error: execution/execution.go:126:16: cannot use proof.Nonce (variable of type hexutil.Uint64) as uint64 value in struct literal

Do you think a local command is needed for build and testing? So that you can comfortably check locally if those things do pass?

[18aaddy]

@gerceboss I'm not sure why the checks are failing as I don't even have execution/execution.go in the files in this PR

[gerceboss]

Try rebasing

[18aaddy]

To resolve errors, I had to update the execution.go file, which is giving a merge conflict. The error in the execution.go file will be solved in PR #96 where I have modified the execution.go file

[gerceboss]

execution.go by @ABD-AZE is the one that we will follow, please first understand that code and then add the modifications if any

[18aaddy]

I understand the code, there were some errors I found while testing, and thus I made modifications
In my final execution_test PR, all my final changes are there. That one will work once the CreateAccessList() function is modified. Then all tests will pass