feat: 🎸 Enhance & updated the code snippets for better utility

[yashksaini-coder]

✅ Closes: #243

This pull request introduces several new functions for string manipulation and conversion, along with enhancements to existing functions by adding input validation. Additionally, it includes a new test suite for the conversion functions.

New Functions for String Conversion:

• pysnippets/Strings/basic_conversion.py: Added number_to_words_basic and words_to_number_basic functions for basic number-to-words and words-to-number conversions.
• pysnippets/Strings/dict_conversion.py: Added number_to_words_advanced and words_to_number_advanced functions for advanced number-to-words and words-to-number conversions using dictionaries.
• pysnippets/Strings/inflect_conversion.py: Added number_to_words_inflect and words_to_number_inflect functions for number-to-words and words-to-number conversions using the inflect library.
• pysnippets/Strings/regex.py: Added number_to_words_regex and words_to_number_regex functions for number-to-words and words-to-number conversions using regular expressions.

Input Validation Enhancements:

• pysnippets/Strings/anagram_detector.py: Added input validation to ensure both inputs are strings.
• pysnippets/Strings/levenshtein_distance.py: Added input validation to ensure both inputs are strings.
• pysnippets/Strings/snake_to_camel.py: Added input validation to ensure the input is a string.
• pysnippets/Strings/string_normalizer.py: Added input validation to ensure the input is a string.
• pysnippets/Strings/string_statistics.py: Added input validation in the __post_init__ method to ensure text is a string.
• pysnippets/Strings/string_utils.py: Added input validation in the __post_init__ method and replace_substring method to ensure inputs are strings. [1] [2]

Testing:

• pysnippets/Strings/test_conversion.py: Added a new test suite using unittest for the conversion functions, including tests for basic, regex, advanced dictionary, and inflect conversions.

TESTING

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@UTSAVS26 kindly review this PR

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