Add validate action tool to foxden CLI

[vkuznet]

This PR contains new validation action tool for foxden CLI as requested from this CHESSComputing/FOXDEN#51

The logic of the code was written by me and partially improved by AI.

Here is an example of its usage:

./foxden validate meta ~/Downloads/record.json --schema=/Users/vk/Wor
k/CHESS/FOXDEN/FOXDEN/configs/ID3A.json

# field did, value /beamline=3a/btr=test-123-a/cycle=2025-3/sample_name=meta-test-6, type
 string
# field facility, value CHESS, type string
# field cycle, value 2025-3, type string
# field pi, value Shanks, type string
# field btr, value test-123-a, type string
# field experimenters, value KSoloway, SClaus, type string
# field beamline, value [3A], type []interface {}
...
────────────────────────────────────────────────────────────
⚠  metadata  /Users/vk/Downloads/record.json — passed with 17 warning(s)
────────────────────────────────────────────────────────────
Warnings:
  [unexpected] doi_provider: field is not defined in the schema
  [unexpected] doi_url: field is not defined in the schema
  [unexpected] sample_chemical_formula: field is not defined in the schema
  [unexpected] schema: field is not defined in the schema
  [unexpected] schema_file: field is not defined in the schema
  [unexpected] doi_foxden_url: field is not defined in the schema
  [unexpected] doi_user: field is not defined in the schema
  [unexpected] doi_access_metadata: field is not defined in the schema
  [unexpected] doi_created_at: field is not defined in the schema
  [unexpected] affiliation: field is not defined in the schema
  [unexpected] doi_public: field is not defined in the schema
  [unexpected] material_safety_hazardous_samples: field is not defined in the schema
  [unexpected] date: field is not defined in the schema
  [unexpected] doi: field is not defined in the schema
  [unexpected] doi_parents_dids: field is not defined in the schema
  [unexpected] energy_foil: field is not defined in the schema
  [unexpected] user: field is not defined in the schema
────────────────────────────────────────────────────────────

I will further improve functionality after initial testing and verification with Kate.