Custom token_text_key in dataset_creator.create()

[vsocrates]

There's a few bugs that breaks the token_text_key parameter in dataset_creator.create(). Namely, at the following line, get_tokens() needs to take in the token_text_key, otherwise it expects the default text.

ehr_deidentification/src/robust_deid/ner_datasets/dataset_creator.py

Lines 139 to 143 in 88751ab

	sent_tokens = [sent_tok for sent_tok in self._dataset.get_tokens(
	text=note_text,
	spans=note_spans,
	notation=notation
	)]

This has downstream effects on a few tokenizers as well. Will make a pull request shortly.