[NLP] Add 'bow' option in lime model explainer

[LexABzH]

Problem

Lime explainer has bow=True, which will sum all occurrences importance for a given word, not using their position.
That's not a problem for bow models, but a same words can have different importance in a sentence for NN models.

Concerned template

• NLP template
• NUM template
• VISION template
• How templates are generated - Jinja

Solution

• Add bow option
• Check if we should change html / list output if bow=False
• Adapt streamlit demo