Move core logic out of `__init__.py`

[sadielbartholomew]

We have a lot of the core logic, including CLI processing, contained presently in the __init__.py file, but since the main function of this file is to initialise the module rather than hold functional logic, I argue we should move at least some of this out to either existing, or new, other modules of the codebase.

Notably, there is input processing via CLI parsing and output processing:

cats/cats/__init__.py

Lines 29 to 33 in 34c951e

	def parse_arguments():
	"""
	Parse command line arguments
	:return: [dict] parsed arguments
	"""

and output processing via the CATSOutput class:

cats/cats/__init__.py

Lines 189 to 196 in 34c951e

	class CATSOutput:
	"""Carbon Aware Task Scheduler output"""
	carbonIntensityNow: CarbonIntensityAverageEstimate
	carbonIntensityOptimal: CarbonIntensityAverageEstimate
	location: str
	countryISO3: str
	emmissionEstimate: Optional[Estimates] = None

all defined there, making the file over 300 lines long.

Unless there is a good reason these are defined there, we should move that logic out to appropriate modules, to keep the __init__.py lightweight module initialisation as per its intention.

Suggestion

I would personally move the CLI parsing out to a new module called cli.py and the CATSOutput and related logic to a new module output.py, or perhaps move all of it out to one new module called interface.py. Happy to take suggestions though, I am not tied to those as the solution.