feat: Introduce a way to pass additional parameters to auhtorization url

[sai-sunder-s]

Sometimes customers might want to pass custom query parameters to the auth endpoint. Adding a property bag like solution so that customers can pass any key, value pair to the auth service.

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Fixes #<issue_number_goes_here> ☕️

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[TimurSadykov]

Maybe we want this to cover all the flows? Not only 3LO? There might be pilot features for 2LO as well.

[TimurSadykov]

just couple test comments

[TimurSadykov]

LGTM