Introduce xclipo to mock lipo

[polac24]

Follow-up to #185:

• Mocks lipo with xclipo that creates a dynamic fat library. The logic is the same as in the xclibtool that just takes any of input files and creates a hard link.
• Add E2E test that covers xclipo scenario. The PR that proves that it covers that - #189 includes only that E2E tests
• ^ E2E test adds a watch extension WatchExtension, which depends on StaticFramework added in #185. To cover both universal binary scenario (static and dynamic), building WatchExtension is enough
• Bumps Xcodeproj to support watch extensions (https://github.com/tuist/XcodeProj/issues/687)

This PR adds support for dynamic fat archives, reported in #187

Fixes #187

[polac24]

@acbdev, as you reviewed #185, do you mind having a look on this follow-up?