chore: Use text-unidecode instead of unidecode package to fix license incompatibility

[kristenarmes]

Description

• Update databuilder to use text-unidecode instead of unidecode due to license incompatibility issues

• Unrelated to the main change, now also ignoring the None type passed to pyparsing's nestedExpr function. In the docstring for this function, it specifically says if no expressions are to be ignored, then pass ``None`` for this argument. so the type definition for the function is incorrect and this is a workaround

Motivation and Context

This fixes license incompatibility issues, since Amundsen is licensed under Apache 2.0 and unidecode is GPL. See this issue for further context: #2148

How Has This Been Tested?

Python tests pass

Documentation

N/A

CheckList

• PR title addresses the issue accurately and concisely
• Updates Documentation and Docstrings
• Adds tests
• Adds instrumentation (logs, or UI events)

[ozandogrultan]

Should we bump up the version of databuilder in setup.py?

[ozandogrultan]

LGTM!