Add MixinExtras annotations to MixinsTranslator and MixinsDummy

[Gaming32]

MixinExtras is on its way to become a standard within Mixin circles, and it would be handy if people coming to ClassTransform from Mixin could use the MixinExtras annotations they feel comfortable with (for example @Local would become @CLocalVariable).

Relevant PRs:

• Fabric: Include MixinExtras FabricMC/fabric-loader#854
• NeoForge: Ship MixinExtras neoforged/NeoForge#303

[Lenni0451]

I have planned to add MixinExtras annotations to the translator.
I'm currently working on a @Share implementation for ClassTransform. I'm not sure which other annotations from MixinExtras I will implement since most of them can just be a @CRedirect or @CInject without any issues

[decce6]

@Lenni0451 @WrapMethod would be a handy addition:

@WrapMethod(method = "unsafeMethod")
private void wrapUnsafeMethod(boolean arg, Operation<Void> original) {
    synchronized (lock) {
        original.call(arg);
    }
}