[5.9][Serialization] Write down SPI-only dependencies as required in swiftmodules #65344
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Ensure clients load transitive
@_spiOnly
dependencies by writing them down in the same category as default imports in swiftmodules. These dependencies will be required for clients loading from swiftmodule and swiftinterface, but hidden from clients loading from a public swiftinterface.The lack of this information was revealed by #64260, as previously clients would see
@_spiOnly
dependencies as normal dependencies.rdar://108326858
Cherry-pick of #65337