Add support for templatic augmentation

[JulesBelveze]

Given a template that represents the pattern and the distribution of the entities, generate new sentences using the entities in the original conll

[chakravarthik27]

Hi @JulesBelveze

For templates are in CONLL format only, right? bcoz, without labels for words form templatic sentences. we can't generate a conll file after augmentation.

For example:

template: The patient takes an {x} drug to cure the {y}disease.

from this template, there is a lack of labels for the, patient, takes .... etc

So, I suggest that users provide in conll format for templates.

[JulesBelveze]

@chakravarthik27 yeah I think that's the way to go ! 🤓