Add Python parity helpers for JS hash utilities

[Copilot]

Adds Python equivalents for the shared JS hash helpers to hash strings and objects with deep key sorting for deterministic output and legacy MD5 defaults (with warnings on invalid algorithms).

• Python hash utilities

  • Implement calculate_hash_from_string and calculate_hash_from_object with deep key sorting, JSON serialization, and legacy MD5 default plus warning-based fallback for unknown algorithms.
  • Expose new helpers via mat3ra.utils package init.

• Tests

  • Add unit coverage for string/object hashing, custom algorithms, and fallback behavior with warnings.

Example:

from mat3ra.utils import hash as hu

hu.calculate_hash_from_string("abc")          # md5 hex digest
hu.calculate_hash_from_object({"b":1,"a":2})  # deterministic hash (keys sorted)
hu.calculate_hash_from_object({"b":1,"a":2}, "sha256")

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