Allow overriding the resource registry

[de-code]

I was trying to use delft version 0.4.0/master via GitHub (as it isn't on pypi yet). (see sciencebeam-trainer-delft draft PR)

One issue trying to use delft.sequenceLabelling.wrapper.Sequence is that the resource registry path is hard coded and it would look for .venv/lib/python3.11/site-packages/delft/resources-registry.json' which doesn't exist (not sure if it would exist if it was in pypi).

Currently in master:

from delft import DELFT_PROJECT_DIR

...
        self.registry = load_resource_registry(os.path.join(DELFT_PROJECT_DIR, "resources-registry.json"))

DELFT_PROJECT_DIR resolves to the package directory in site-packages.

In 0.3.4 that was a relative path:

        self.registry = load_resource_registry("delft/resources-registry.json")

For my use case, I don't even use embedding vectors most of the time. If I do, I'd like to have control over it as well (I have a separate EmbeddingManager, I can't quite remember for what purpose but dynamically loading embedding files was probably one of the reasons).

So I would like to be able to avoid loading the registry unless needed, and be able to influence loading instances of Embedding.

Suggested options:

• add a function like get_embedding(self, embedding_name: str)., I can override it, default can dynamically load registry.
• or optional parameter for registry
• or optional parameter for resource registry path

[de-code]

I used a workaround for now, by automatically linking the file I have with where delft expects it, if needed: eLifePathways/sciencebeam-trainer-delft@5187779