Update Pull Request template #3151
Description
Update the pull request template to include short, concise information+links in checklist form to resources regarding:
- Conventional Commits for help with PR titles
- When to consider a release "breaking" (and to use the appropriate conventional commit syntax in the PR title)
- Updating the USWDS version
- Updating the React Major version
- Any update that would potentially require an existing user of the library to make a code change to their implementation (e.g. adding a new required prop to a component)
- Changing the default behavior of a component in such a way that a consumer of the library would have to make a change to preserve their current functionality.
- A reminder to add the PR author as a repository contributor via the all-contributors bot, if needed
Anything else folks think would be helpful!