Resource reloaders are context-less

[Gaming32]

Problem

Vanilla's resource reloaders are constructed anew on each reload get access to some context, notably the parameters to DataPackContents. Since 1.20.5, I need access to the RegistryWrapper.WrapperLookup for deserialization context.

Potential Solution

Instead of just having a global list of pre-created of resource loaders, create an event to register reload listeners with context arguments passed in (ideally the DataPackContents and RegistryWrapper.WrapperLookup). This would be similar to fabric-networking-api, where both global and context-based receivers may be registered.

[melontini]

#3083 This PR has been shelved since 1.20, maybe someone wants to revive that?

In the meantime, I have to inject the reloaders myself, which doesn't sound very safe. (I'm not even sure if reloaders are sorted by the resource loader) DataPackContentsMixin

[Gaming32]

Reloaders added not through the API will always be grouped where their added. Any reloaders added by the API are sorted and inserted after all other reloaders.