Armstjc/add retrosheet Release Candidate 2

[armstjc]

• Adds Retrosheet data functionality to the sportsdataverse-py Python package.
• Adds Retrosplits data functionality to the sportsdataverse-py Python package.
• Cleaned up pre-existing code for MLBAM functions in sportsdataverse-py.
• Updated docs to add references to the new, MLB-related functions.

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Name	Status	Preview	Updated
sportsdataverse-py	✅ Ready (Inspect)	Visit Preview	Sep 4, 2022 at 11:50PM (UTC)