Consistent package configuration on Lodestar libs

[dapplion]

There are some actions that should be done on all Lodestar libraries that are not in the monorepo:

• Add CI: A Github Actions workflow that builds, tests and lints
• Same Typescript, linter and prettier dependency versions are used as in the Lodestar monorepo
• Same tsconfig.json is used. @3xtr4t3rr3str14l Already started on this item by setting strictNullChecks = true
• Same prettier settings are used
• Same eslintrc settings are used
• Add codeowners with the entire Eth2.0 team so reviewers are asked automatically
• Review READMEs that link to the Lodestar project
• Apply README checks (i.e. what is basically outlined in Investigate and implement tooling to ensure README files are accurate across all packages #2828)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 15 days if no further activity occurs. Thank you for your contributions.

[3xtr4t3rr3str14l]

once #2841 is approved and merged, we should apply the same process to the other lodestar-related packages that are not housed within the monorepo (ssz, bls, etc)

[dapplion]

@wemeetagain After merging SSZ repos and BLS repos we should apply this issue to them to on par with the Lodestar monorepo

[wemeetagain]

related to #6011