Add macOS binary build to release workflow

[adamtheturtle]

This PR adds support for building and distributing macOS (ARM) binaries in the release workflow.

Changes

• release.yml: Added a new build-macos job that:

  • Runs on macos-latest (Apple Silicon)
  • Waits for PyPI propagation
  • Builds both vws-macos and vuforia-cloud-reco-macos binaries using PyInstaller
  • Uploads the binaries to the GitHub release

• README.rst: Added a new "Pre-built macOS (ARM) binaries" section that points to the full documentation

• docs/source/install.rst: Added detailed installation instructions for macOS binaries including:

  • curl commands to download and install the binaries
  • Instructions for removing the quarantine attribute (xattr -d com.apple.quarantine)

This follows the same pattern as the existing Windows and Linux binary builds.

---

Note

Adds macOS distribution alongside existing Linux/Windows.

• New build-macos job in release.yml builds vws-macos and vuforia-cloud-reco-macos with PyInstaller after waiting for PyPI propagation, then uploads artifacts to the GitHub release
• README.rst and docs/source/install.rst updated with macOS (ARM) binary installation steps, including curl commands and quarantine (xattr) guidance

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