Publish ABIs for core contracts

[yorhodes]

Expected Behavior

Canonical (or versioned) ABIs published in public GCP bucket (preferably signed or CIP8?) for consumption by community

Current Behavior

No reference ABIs anywhere (only ContractKit typechain artifacts)

[yorhodes]

If these ABIs are intended for bytecode verification in blockscout, we need to save the build artifacts used during make-release for each environment.

We should also be compiling with solc --metadata.

Useful links
https://docs.soliditylang.org/en/v0.5.8/metadata.html
https://github.com/ethereum/sourcify#security-precautions

[yorhodes]

followup with @tkporter

[github-actions]

This issue is stale and will be closed in 30 days without activity