Add support for Spacy transformer models (GPU)

[martin-kirilov]

Spacy 3 introduced new transformer-based models that can be run on GPU. I think it's a good idea to add support for these types of language models in AllenNLP, since now it doesn't work out-of-the-box.

My suggestion is to add an option to specify whether to load the model on CPU or GPU, and also use it accordingly.
This would require changes to both allennlp and allennlp-models, as in some models (e.g. SRL), there should be made some changes to the torch tensor management.

[epwalsh]

Hey @martin-kirilov, this sounds like a good feature to have. Feel free to submit a PR if you get a chance.

[github-actions]

@epwalsh this is just a friendly ping to make sure you haven't forgotten about this issue 😜