ARM64 Windows support

[danieljurek]

As discussed in previous standups, we should add support for Winnows on ARM64. This would take a form similar to our MacOS support today:

• Alpha+ stage
  • Cross-build binaries on Windows x86_64
  • Add to PR notes
  • Add to GitHub and Storage releases (no direct support for installers or other channels yet)
  • Binary only in a releasable .zip file (with NOTICE.txt)
  • azd --version smoke test only on an ARM64 windows machine (no e2e or other tests)
• Beta+
  • Tests running on Windows ARM64 agents
  • MSI w/o Custom Action (needed only for telemetry
• GA
  • MSI with Custom Action (how does this get cross compiled?)
  • Add to all releases (install scripts/winget/choco)

Other considerations:

• How do we bootstrap tools? (like bicep, etc.)

[danieljurek]

Things to remember:

• Cross builds happen on x86_64 machines https://github.com/Azure/azure-dev/blob/main/eng/pipelines/templates/jobs/cross-build-cli.yml
• Tests run on ARM64 machines in scheduled builds