Bot to inspect PRs

[plfiorini]

We should have a bot that does some checks before a PR can be merged, that is:

• Verify if the appropriate license and copyright notice was used
• Spell checking the commit message
• Check formatting with clang-format

The bot will use the GitHub status check API so we can integrate it.

[plfiorini]

An example is: https://jorisroovers.github.io/gitlint/

[SkyzohKey]

You don't need a bot for that, just use a git post-hook, or if you really needs a bot Gitcop does a great job. :)

[plfiorini]

Work started on a status check as a Github action: https://github.com/liri-infra/lint-action