Refactor: complete serializers reorganization

[akintewe]

Changes Made

• Created new serializers folder in apps/data_handler/handler_tools/data_parser/
• Separated serializers into two files based on their domain:
• nostra.py: Contains Nostra-related serializers
• zklend.py: Contains zkLend-related serializers
• Created __init__.py with proper imports and exports from both files

Closes #307

[djeck1432]

Please, run black command for your files
Remove this file [get-pip.py](https://github.com/CarmineOptions/derisk-research/pull/317/files#diff-333f925f52b4ce75f65b3e49a8a71acd851ab66561480309d9e34de7a888a452)

[akintewe]

Please, run black command for your files Remove this file [get-pip.py](https://github.com/CarmineOptions/derisk-research/pull/317/files#diff-333f925f52b4ce75f65b3e49a8a71acd851ab66561480309d9e34de7a888a452)

Done Please review

[djeck1432]

Please, close this pr and create new one, I asked you to run only for files which you have changed, you ran it for all of them. I would be hard to do code review for you code.

[akintewe]

Please, close this pr and create new one, I asked you to run only for files which you have changed, you ran it for all of them. I would be hard to do code review for you code.

oh my bad, got it, ill do that now