fix: Add fields to generated files in deterministic order

[mklaber]

Description

Sometimes the QB API likes to return fields in a different order. The only way to ensure that any two runs of qbc run model-generate produce the same output, we need to sort the fields each time.

This PR:

• Modifies the get_fields_for_table_aaaaaa.json mock data to illustrate this phenomenon
• Sorts fields by field ID before adding them to a file
• Tests this ordering

Checklist:

• Submitting to dev branch
• pytest tests passing
• Includes tests to cover the changes
• flake8 passing
• Relevant documentation added

[mklaber]

@tkutcher If you want to see an example of where I observed this behaviour feel free to email me at klaber at gmail. I'd rather not post it publicly.

[tkutcher]

Never realized this. I'm good with this - will take your word for it! The sort certainly won't hurt anything. I'll get it in there soon.