Add webidl annotation to pass InCompartment argument to DOM methods

[jdm]

Based on the work in #23253:

Let's add a new in_compartment property to this configuration - for a given interface, this property will be a list of method/property names that expect to receive InCompartment arguments.

We will need to store this in_compartment in this code so we can query it later during code generation.

The easiest place to start is with methods in this code. We can treat this similarly to deciding whether to provide a *mut JSContext argument or not, by making the caller tell us whether this is a method that should provide an InCompartment argument or not.

[jdm]

It's easiest to start small here - make the fetch method from Window.webidl take an InCompartment object, and adjust the code generation until everything lines up.

[Eijebong]

Should all the methods asserting AlreadyInCompartment use that ?

[jdm]

That's the idea behind this work, yes.