Supporting More Web APIs in `web-sys`

Ensure that the .webidl file describing the interface exists somewhere within the crates/web-sys/webidls/enabled directory.

First, check to see whether we have the WebIDL definition file for your API:
```
grep -rn MyWebApi crates/web-sys/webidls
```
- If your interface is defined in a .webidl file that is inside the crates/web-sys/webidls/enabled directory, skip to step (3).
- If your interface isn't defined in any file yet, find the WebIDL definition in the relevant standard and add it as a new .webidl file in crates/web-sys/webidls/enabled. Make sure that it is a standard Web API! We don't want to add non-standard APIs to this crate.
- If your interface is defined in a .webidl file within any of the crates/web-sys/webidls/unavailable_* directories, you need to move it into crates/web-sys/webidls/enabled, e.g.:
```
cd crates/web-sys
git mv webidls/unavailable_enum_ident/MyWebApi.webidl webidls/enabled/MyWebApi.webidl
```
Regenerate the web-sys crate auto-generated bindings, which you can do with the following commands:
```
cd crates/web-sys
cargo run --release --package wasm-bindgen-webidl -- webidls src/features
```
You can then use git diff to ensure the bindings look correct.