feat(ci): release workflow

[erikburt]

Adds a release workflow to automate versioning, creating draft GH releases.

Features

• Automated versioning + draft GH release
  • In the simplest case, it only requires providing the module path
• Automatically chooses the version:
  • Gets latest release (git tag) for the module, based on a preset format for modules/submodules
  • Diffs the public API from the ref to be released, and the latest released version.
  • Uses versioning heuristic from gorelease
    • If no public changes - patch bump
    • If no breaking changes - minor bump
    • If breaking changes:
      • version >= 1.0.0 errors, must override version manually to release
      • version < 1.0.0, changes to a minor bump
• Release notes: passes the summary output from apidiff-go into the release notes of the draft release
• Support for non-standard releases (hotfixes, initial releases)
• Approval gating (requires some repository setup)
• Dry-run option
  • Requires no approval, doesn't create any GH relese.

Notes

I have tested this, but this is probably going to need a few iterations after dog-fooding here. The dry-run option is useful, but as the GH releases are created as draft, this technically publishes nothing without a human clicking "publish" after the workflow has ran.

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DX-2323