Add pull request template

[dakinggg]

Adds a pull request template.

Examples from other repos:

• AllenNLP: https://raw.githubusercontent.com/allenai/allennlp/main/.github/pull_request_template.md
• Spacy: https://raw.githubusercontent.com/explosion/spaCy/master/.github/PULL_REQUEST_TEMPLATE.md
• Pytorch: https://raw.githubusercontent.com/pytorch/pytorch/master/.github/PULL_REQUEST_TEMPLATE.md
• Flask: https://raw.githubusercontent.com/pallets/flask/main/.github/pull_request_template.md
• Opencv: https://raw.githubusercontent.com/opencv/opencv/4.x/.github/PULL_REQUEST_TEMPLATE.md
• Ansible: https://raw.githubusercontent.com/ansible/ansible/devel/.github/PULL_REQUEST_TEMPLATE.md
• Scikit-learn: https://raw.githubusercontent.com/scikit-learn/scikit-learn/main/.github/PULL_REQUEST_TEMPLATE.md
• Huggingface: https://raw.githubusercontent.com/huggingface/transformers/main/.github/PULL_REQUEST_TEMPLATE.md
• Lightning: https://raw.githubusercontent.com/Lightning-AI/lightning/master/.github/PULL_REQUEST_TEMPLATE.md

Common elements from those other repos, for inspiration in case you think my template is missing something:

• Summary
• Related issues
• Breaking changes?
• Checklist
  • Is there an issue?
  • Did you read contributor guidelines?
  • PR does one thing?
  • Did you update any docs related to this change?
  • Did you write new tests?
  • Did you verify tests pass locally?
  • Update the changelog?
  • Is it a docs change?
• Reviewing checklist for how to review
• Something fun (e.g. thank you, meme, joke etc)
• Description of who to ask for review
• Pull request type
• License stuff (e.g. is this change compatible with our license)
• Link to contributing.md
• pre-commit instructions

Screenshot of what the markdown looks like (checklist should be rendered properly on github):

Closes CO-117

[mvpatel2000]

LGTM, though defer to Hanlin on this. Big question is how external vs. internal we want this to be -- for example, internally we want to tag JIRA issues instead of Github issues. Should the template reflect this? I'm personally fine leaving as github in the template

[hanlint]

LGTM! I think the issues section we can put our internal JIRAs if needed

[dakinggg]

Ah yeah, I was definitely writing this more for an external audience, but internally we can put JIRA tickets instead of github issue.