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Add support for character classes `[...]` (#250)

* Add support for character classes `[...]`

Also, fix the quantifiers more expressive.
I.e., now it supports: {,4}, {4}, {1,3}, {1,} instead of just {1,3} and {1,}

* Support class characters when no input_symbols are given

* Lint fixes and one more test

* Fixx issue with reserved characters inside character class

* Add missing annotation

* Add support for escaped characters and properly handle special chars like ('\')

* Add support for shorthands

* Allow reserved chars in input symbols and tokenize spaces

We also added more complex tests

* Address code review feedback

- Move imports to top of nfa.py file (no repeated imports in functions)
- Replace if/elif chains with dictionary-based lookups for shorthand character classes
- Fix 'in' vs '==' operator usage for single character comparisons
- Use dict.get() method for escape_map lookup
- Remove spaces from regex patterns in test cases
- All tests passing (418 passed, 25 skipped)

* Changes for CI

* Update test_regex.py

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Co-authored-by: Eliot Robson <eliot.robson24@gmail.com>

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