Provide no-ops implementations for JS/WASM

[buenaflor]

Description

To improve compatibility we should provide no-ops for JS and WASM so people can compile their projects without having to separate source sets

[Legion2]

We are currently using sentry-kotlin-multiplatform in our shared common source set and now want to add wasm target, we successfully updated all our kotlin common dependencies to support wasm target, but only sentry-kotlin-multiplatform does not support wasm. We would be fine with having a no op for wasm just to be able to compile the source set.

[buenaflor]

yup makes total sense, I'll tackle this soon since I am doing some JS work on our Flutter SDK as well :D