Comprehensive differential E2E tests

[xermicus]

Differential E2E tests help us ensure ETH compatibility as well as reproducible builds across supported platforms.

A comprehensive testing framework is currently being developed. We need a CI workflow which uses the harness and executes implemented cases (after all other workflows succeeded) as follows:

The following resolc binaries should be tested per platform.

• Linux MUSL
• MacOS universal
• Windows
• Wasm32 emscripten

The following networks must be used for test output differentiation (return data, emitted events, state diffs regarding storage):

• Westend
• Ethereum

The following settings must be tested:

• -O3
• -Oz
• -g

Any final compilation artifacts (i.e. PVM blobs) equal each others exactly for each platforms and compiler setting combinations, which the workflow must verify.

[xermicus]

Depends on: paritytech/evm-test-suite#47