swift: Migrate to Swift Testing

[pminev]

Now for the Swift wrapper we're using XCtest which is only for MacOS, but the community is pushing more Swift Testing.

Before start transitioning check:

• CMake integration
• other platforms support such as Windows
• VS/ VScode/

[iboB]

the priority of this is more or less bound to #154 If we decide to go with #154, we'll also do this issue