PII Modifier should support documents greater than pre-configured length

[praateekmahajan]

Is your feature request related to a problem? Please describe.

Under the hood Pii Modifier uses Presidio (which uses spacy I believe).
Currently if the documents are very long (I believe 2,000,000 chars in length) then presidio errors out. See microsoft/presidio#957 (comment)

To solve this we might need to modify the nlp object that Presidio is using or create a new class that allows the modification of character limit.

For now to avoid this I've done

    dataset = DocumentDataset(
        dataset.df[dataset.df['text'].map(
            lambda x : len(x) < 2_000_000, meta={"text" : int}
        )]
    )

Describe the solution you'd like
support a max_char_length as an arg e.g. PiiModifier(max_char_length=3_000_000)

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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