feat(ethers-compile): ethers-compile crate to refactor compilation

[refcell]

Overview

This PR picks up on #936 .

Motivation

Currently, compiler support is unstructured.

Solution

Introduces a Compiler trait among other abstractions to create a canonical interface for implementing compiler support.

PR Checklist

• [x] :gear: Compiler Trait
• [ ] :ship: Implement the Compiler trait for ethers-solc
• [ ] :test_tube: Testing