infra: source github templates

.github/ISSUE_TEMPLATE.md

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+<!--
+Thank you for taking the time to report an issue! We're glad to have you involved with uv.
+
+If you're filing a bug report, please consider including the following information:
+
+* A minimal code snippet that reproduces the bug.
+* The command you invoked (e.g., `uv pip sync requirements.txt`), ideally including the `--verbose` flag.
+* The current uv platform.
+* The current uv version (`uv --version`).
+-->

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thank you for contributing to uv! To help us out with reviewing, please consider the following:
+
+- Does this pull request include a summary of the change? (See below.)
+- Does this pull request include a descriptive title?
+- Does this pull request include references to any relevant issues?
+-->
+
+## Summary
+
+<!-- What's the purpose of the change? What does it do, and why? -->
+
+## Test Plan
+
+<!-- How was it tested? -->