build: integrate release-please for handling releases

[mattr-]

Using release-please for release management streamlines our release process a bit. release-please will run on commits to the default branch and do the following for us:

• Create a PR to handle our version and changelog updates
  • Update History.markdown with new version information
    • The format does change slightly, but with squash merges in place, links to PRs will still be provided.
    • Sections in the file are customizable with some effort. By default, only user visible changes are included.
  • Update the version number based on the metadata provided via conventional commits
    • For bug fixes, only the patch version will be bumped
    • When features are included, the minor version will be bumped
    • When breaking changes happen, the major version will be bumped.
• After merging a release please PR, it will handle tagging and creating a github release. Follow up actions will happen (such as releasing a gem) based on our already existing workflows

[mattr-]

Merging so I can create release demos.