Initial support for Swift export

[sbogolepov]

Some notes:

• We re-use Kotlin/Wasm stdlib klib to avoid downloading huge Kotlin/Native distribution. Should be fine as for now, Swift export supports a limited set of declarations from stdlib.
• Re-use existing endpoints for js/wasm translation.
• All Analysis API & Swift export dependencies are hidden in a separate module to avoid cluttering the main build.gradle.kts.

There might be bugs. We will squash them as soon as possible :)

[nikpachoo]

DO NOT MERGE IT.
The Swift export works on RC2.

[nikpachoo]

A note for the devs: in prod, we use "swift-export-v1" branch