lute test library: Adding arbitrarily nested 'suites'

[Alexander-L-Robert]

Current:
lute's std/test only supports a suite -> case heirarchy.

Desire:
I'm used to being able to have nested subcategories with testez by nesting multiple describes within each other.

Example:
Nest structure I want:

(each nested bullet point would be a subcategory, where any subcategory can have unit tests (for tests that don't fit into any subcategory) or more subcategories:

• formatFoundationTags Lint suite
  • strict matching (default)
    • plain strings
    • concatenation
    • conditional string assignments
    • string interpolation cases
  • loose matching
  • config rules

What I currently have

• strict matching (default) suite
  • plain strings unit tests
  • concatenation unit tests
  • conditional string assignments unit tests
  • string interpolation cases unit tests
• loose matching suite
• config rules suite