Spacy Loading can be done once

[Kaustubh Dhole]

Many transformations load spacy multiple times and reparse the same utterance. We will need a mechanism to load spacy once and parse once or at least cache the parse for a string so that when running all transformations together, there is no repetition of parsing.

[Aadesh Gupta]

#117

For caching part we can open a different issue/new feature.