Repox

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**Improvements**

* Added schedule_harvest() method.
* Added schedule_weekly_harvest() method.
* Added get_recently_ingested_sets_by_aggregator() method.
* Added get_list_of_scheduled_harvests_by_provider() method.

**Trivial and Dev Things**

* Switch to letting Sphinx automatically handle todos.
* Properly format XML output in docstrings.
* Switch type of return for count_records_in_set() to int.

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**Improvements**

* Added get_list_of_sets_by_provider() method.
* Added get_options_for_harvests()
* Added doctests and docs for:
- get_options_for_records()
- get_options_for_mappings()
- get_aggregator_options()
_ get_mapping_details()

**Trivial and Dev Things**

* Separated packages and dev packages.
* Integrated pre-commit, black, and Flake8 into workflows.
* Created todo list.
* Created release history / change log.
* Created CONTRIBUTING.md.

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* Birth and conception