Export public types from auth-exp

[hsubox76]

Export public types from auth-exp main package entry point.

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[Feiyang1]

We can't export classes as types because it allows people to new them. Should they be interface instead? If we want to export the actual classes, the implementation should be exported instead.

[hsubox76]

Seems like MultiFactorResolver can be an interface. The other ones are real classes that are already exported, so I am removing those type exports. They could maybe be removed from auth-types-exp/index.d.ts entirely but that's where the documentation comments are and the code class is linking to them using @inheritDoc.