chore: add pull request and issue templates

[shivlaks]

Description

Added in some templates for issues and a checklist for pull-requests, inspired by the CDK.

Issue templates

These templates will be used for users who create Issues for the repo. Users will
be presented with options based on whether they are filing a feature-request, bug, or doc.

Pull request template:

This template will be applied whenever a pull request is

Note: one difference between the current message is that the licensing text has been updated
to reflect the license we use in the repo

Templates are pretty self-explanatory in terms of the details we will request.

Open

• We may need to make some updates to CONTRIBUTING guide but wanted to settle on content first
  • i.e. do we want to follow conventional commits - i just kind of threw that in the PR checklist
• How is the current PR boilerplate content generated? I think it's default but want to confirm we haven't configured it anywhere

The questions/directives are somewhat opinionated, but your opinion matters the most. drop a comment 👇 and I'll work it in

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[ca-nguyen]

Loving this! Thanks for adding these templates!

Great to see the issue templates - standardizing the way the information is presented will help improve investigation time and communication!

Adding a PR checklist ensures all steps have been covered before a PR is submitted and will shorten the review process. 🚢

[StepFunctions-Bot]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildProject6AEA49D1-sEHrOdk7acJc
• Commit ID: 5cf32a8
• Result: SUCCEEDED
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