Use implementation only import of Foundation in PackagePlugin #3408
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This is the same as #3404 but for PackagePlugin.
Motivation:
As with PackageDescription, PackagePlugin should not have an interface dependency on Foundation. There is no specific current problem but reducing the dependencies here is cleaner.
Modifications:
Convert one import of Foundation to implementation-only (we need it for decoding the JSON coming from SwiftPM and for encoding the JSON sent to SwiftPM).
Remove another import of Foundation altogether; it was only left over from code that has since been removed.