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"@logto/schemas": minor
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add oidc params variables and types

- Add `ExtraParamsKey` enum for all possible OIDC extra parameters that Logto supports.
- Add `FirstScreen` enum for the `first_screen` parameter.
- Add `extraParamsObjectGuard` guard and `ExtraParamsObject` type for shaping the extra parameters object in the OIDC authentication request.