Fix symlinks in generated XCFramework

[simolus3]

The kmmbridge Gradle plugin uses a Gradle Zip task to create a .zip archive of an XCFramework directory for the compiled Kotlin code.

On macOS, the layout of an XCFramework typically looks like this:

PowerSyncKotlin.xcframework/
├─ macos-arm64_x86_64/
│  ├─ Versions/
│  │  ├─ A/
│  │  │  ├─ .../
│  │  ├─ Current/    (symlink to ./A)

However, the Gradle Zip task does not support preserving symlinks when creating zip files. Instead, these files are copied into the uploaded archive. It looks like XCode is not consistently fine with this, sometimes attempting to readlink the Current/ directory in the xcframework even when it is a regular directory. This fails, breaking macOS builds.

This PR applies a hack to the publishing logic for the :PowerSyncKotlin project that will delete the archive created by Gradle only to re-create it with a zip invocation (we can't replace the task because it's created by the KMMBridge plugin). That allows using this project in macOS apps built with Swift.

I've tested this by changing Package.swift here, replacing the path for the binary target with the created archive:

.binaryTarget(
    name: packageName,
    path: "PowerSyncKotlin/build/faktory/zip/frameworkarchive.zip"
)

(run ./gradlew PowerSyncKotlin:zipXCFramework to create it). Pointing our Swift SDK at that package allows building macOS apps. See: powersync-ja/powersync-swift#44