Don't save kebab-case aliases in the params map

[bentsherman]

Close #4033

This PR attempts to resolve some quirks with the params map by separating the alias behavior from the read-only behavior. It adds an AliasMap which can be used to create a map that aliases between kebab-case and camelCase. The params map re-uses this class internally.

Still need to add some tests.

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[bentsherman]

Confirmed that it works with the test case in the linked issue

[bentsherman]

Simplified it further:

• When CLI params and params file are parsed, kebab-case params are automatically converted to camelCase. Only the camelCase key is stored.
• The params map does not do any aliasing, since kebab-case params have already been converted, and the kebab-case variant does not need to be read