feat: add Zarr file format support

[Balamuralikrishna123]

Hi, i am Krishna, a GSoC 2026 applicant interested in the AIDRIN
project. i noticed Zarr format support was missing from the readers
so i went ahead and implemented it.
What i did:

• added zarr_reader.py with read(), parse() and filter() methods
• follows the same pattern as existing readers like hdf5_reader.py
• registered zarrReader in READER_MAP in file_parser.py
• added Zarr to SUPPORTED_FILE_TYPES for frontend display
• tested locally with zarr v3, reader successfully loads zarr
  arrays into pandas DataFrame This is part of the GSoC 2026 proposed work to add support for
  new file formats including Zarr, ROOT and HDF5.
  please let me know do i need to changes . thank you.

[jeanbez]

Krishna, you can express your interest in AIDRIN using this form:

https://forms.gle/hxX57Ute87t1z8X79

[Balamuralikrishna123]

Hi Jean Luca, thank you for replying! i already filled that
form yesterday itself. will be waiting for the response. also i
am planning to work on the ROOT reader next so will keep
contributing to the codebase in the meantime!