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Describe in detail the changes you are proposing, and the rationale.

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Link any GitHub issues to be fixed by this PR, and add references to
prior related PRs.

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Fixes #

## Target Release

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- [ ] 1.4.x
- [ ] 1.3.x

## Draft CHANGELOG entry

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- [ ] NEW FEATURES
- [ ] UPGRADE NOTES
- [ ] ENHANCEMENTS
- [ ] BUG FIXES
- [ ] EXPERIMENTS

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Add initial pull request template
Add initial pull request template

This is intended to add some structure to pull request descriptions, and
encourage peer review of changelog entries before merging a PR.
