gtfs clean_feed() pipeline

[ethan-moss]

Description of the Feature to be Added

The sequence of GTFS cleaning steps is highly dependent on both ordering requirements and user needs. An ability to flexibly map GTFS cleaning steps to a user's request would be useful feature to give flexibility and control over cleaning methods.

(OPTIONAL) Suggested Implementations

A list of dicts could be used, where keys are the cleaning function and values are another dict corresponding to argument/value pairs for the cleaning functions, e.g.:

gtfs_clean_pipeline = [
	{
		"clean_multiple_stop_fast_travel_warnings": {
			"max_distance": 10,
			...
		}
	},
	{
		"clean_consecutive_stop_fast_travel_warnings": {
			...
		}
	},
	...
]

Additional context

Feature request raising from PR #125

[r-leyshon]

Migrated to datasciencecampus/assess_gtfs#11