Mutation operations

[kshinn]

Motivation

The current functionality in EthQL is read-only and provides extra functionality in entity decoding. This is limits the use of dApps building on Ethql as it doesn't cover the write operations (call and sendTransaction

Description

Create a Mutation interface that covers the missing write method sendRawTransaction.

Definition of Done

Add a new plugin for the system that covers the missing Mutation operations.