[Task] Remove unnecessary `#[wasm_bindgen]` macros in wasm bindings

[wulfraem]

Description

We have some class functions marked with #[wasm_bindgen] without any attributes. Those can be removed as long as the impl itself already has a wasm_bindgen macro, e.g. #[wasm_bindgen(js_class = Foobar)].

Motivation

Current state is not breaking, but removing the unnecessary macros cleans up the code a bit.

Change checklist

Add an x to the boxes that are relevant to your changes, and delete any items that are not.

• [ ] The feature or fix is implemented in Rust and across all bindings whereas possible.
• [ ] The feature or fix has sufficient testing coverage
• [ ] All tests and examples build and run locally as expected
• [ ] Every piece of code has been document according to the documentation guidelines.
• [ ] If conceptual documentation (mdbook) and examples highlighting the feature exist, they are properly updated.
• [ ] If the feature is not currently documented, a documentation task Issue has been opened to address this.