Add Release Drafter process

[amenocal]

Description

Ports the Release Drafter so this repo automatically maintains draft release notes and resolves the next version from PR labels. On every merge to main, Release Drafter groups merged PRs into categorized changelog sections and computes the version bump; the existing release.yml still handles publishing precompiled binaries when a v* tag is pushed.

Adds three files:

• .github/release-drafter.yml - changelog categories, version resolver, and release note template.
• .github/workflows/release-drafter.yml - workflow that updates the draft release on pushes to main.
• .github/pull_request_template.md - documents the labeling scheme that drives versioning and categorization, plus a contributor checklist.

Checklist

• I have added the appropriate label to this PR according to the type of change
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests

Additional Context

N/A

[pmartindev]

LGTM 🚀