Simplify adding new component to existing model with CLI

[adrianeboyd]

Feature description

It looks like these kinds of cases aren't easy to handle with the train CLI:

1. I want to train a model from scratch given vectors, one corpus for the tagger, and one corpus for the parser. (See example in Multiple roots per sentence #4306.)

2. I have a model with a tagger and want to add a parser trained on a separate corpus.

For the internal spacy models, it looks like each component is trained separately and then they are combined using custom scripts.

Could it make sense to have a CLI component that combines models/components (with compatibility checks, of course)?

Case (2) is really just a minor variant of (1), but the train CLI might be able to handle it relatively easily by combining the components in model-final, for example. I think case (1) could be handled by the train CLI in theory, but the command-line options would get too complicated and it would be easier to handle it with a separate CLI command.

(What is the right way to combine the vocab directories (aside from vectors) for multiple models?)

[lock]

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