Add description field to recipe schema and backend utilities

[rugeli]

Problem

closes AllenCell/cellpack-client#140

Solution

• implemented support for a top-level description field, in:
  • validation schema (also added missed randomness_seed)
  • recipes
  • documentation
  • upload/download script
  • unit tests

Type of change

• New feature (non-breaking change which adds functionality)

Steps to Verify:

• upload a recipe to you DEV firebase upload -r examples/recipes/v2/peroxisome.json
• confirm the new description field appears under the recipe document
• verify schema validation passes validate examples/recipes/v2/peroxisome.json

Screenshots (optional):

example of uploaded recipe doc in firebase

[github-actions]

Packing analysis report

Analysis for packing results located at cellpack/tests/outputs/test_spheres/spheresSST

Ingredient name	Encapsulating radius	Average number packed
ext_A	25	236.0

Packing image

Distance analysis

Expected minimum distance: 50.00
Actual minimum distance: 50.01

Ingredient key	Pairwise distance distribution
ext_A