Bring GzipSink/GzipSource to the rest of the targets

[Wavesonics]

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Being able to use Gzip in common code would be a killer feature.

I surveyed the other options out there:

• Korge supports more targets, but not all of them, and has some limitations around using Gzip with streams
• KotlinxIO doesn't support it at all yet

Would love to see a pure KMP implementation of Gzip!