Allow `text_to_snake_case` to be opt-out on `id_` creation about mermaid-py

[ouhammmourachid]

Dear @HASPIMA ,

Thank you for reaching out and providing valuable feedback on the library. I truly appreciate your detailed explanation of the issue you encountered and the proposed solutions to address it.

After carefully considering your suggestions, I agree that modifying the regular expression to allow dots (.) and dashes (-) would be a beneficial enhancement to the library. This change would enable users to maintain the desired structure of their node identifiers without losing important information during the conversion process.

Moreover, I believe that this adjustment will not cause any compatibility issues as it expands the range of characters allowed in node identifiers while preserving the existing functionality for users who prefer snake case format.

[HASPIMA]

Hey @ouhammmourachid, thank you for your insightful feedback. After evaluating what we said, I agree #99 would be a better solution candidate for this issue, in the meantime I'll be closing #100 referencing this comment.

Thanks so much for your quick response, I'll keep on finishing #99 just so we can have this issue fixed. Ohh, more thing, can you add this repository to the PyPi project? It took me longer than it should have, to find this repo heheh, that'll be much appreciated. Have a good one!