Macro support via Dependencies.swift

[waltflanagan]

Resolves #5488

Short description 📝

This allows non-macos targets to depend on packages that provide macros.

How to test the changes locally 🧐

Run fetch and generate against the fixture framework_with_swift_macro. Framework should build when depending on packages that provide macros via Dependencies.swift

Contributor checklist ✅

• The code has been linted using run make workspace/lint-fix
• The change is tested via unit testing or acceptance testing, or both
• The title of the PR is formulated in a way that is usable as a changelog entry
• In case the PR introduces changes that affect users, the documentation has been updated

Reviewer checklist ✅

• The code architecture and patterns are consistent with the rest of the codebase
• Reviewer has checked that, if needed, the PR includes the label changelog:added, changelog:fixed, or changelog:changed, and the title is usable as a changelog entry

[danieleformichelli]

Can we bump TCA dependency in app_with_spm_dependencies fixture to make sure it compiles fine? 🙏

[fortmarek]

👏

As @danyf90, it would be great to bump the TCA to make sure that dependency builds 😌