Merge pull request #1121 from gregdhill/feat/pr-templates

feat: add pull request templates

.github/PULL_REQUEST_TEMPLATE/pull_request.md

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+# Description
+
+Please include a summary of the changes and the related issue. Please also include relevant motivation and context.
+
+Closes # (issue)
+
+## Changes
+
+[List your changes here]
+
+## Checklist
+
+- [ ] Added relevant unit / integration tests
+- [ ] Updated benchmarks for worst-case complexity
+- [ ] PR does not introduce unchecked arithmetic
+- [ ] PR does not introduce unbounded operations / storage
+- [ ] Implements extra fees or storage deposits (if necessary)

.github/PULL_REQUEST_TEMPLATE/release.md

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+# Release vX.X.X
+
+## Checklist
+
+- [ ] Bumped `spec_version`
+- [ ] Updated weights (`/run_benchmarks`)
+- [ ] Includes necessary migrations
+- [ ] Tested with chopsticks / try-runtime
+- [ ] Tag and publish