JSON RPC methods that used transaction as payload now only takes 1 param

[bchamagne]

Description

Wrap the transaction payload inside a "transaction" object for these 3 methods: SimulateContractExecution, EstimateTransactionFee and SendTransaction.

Fixes #1225

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

This require the 3 SDKs to be updated.

• libgo
• libdart
• libjs

How Has This Been Tested?

Unit tested

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules