Plaid-python

- [Breaking] Renamed `/user_account/session/get` operationId `sessionGet` to `userAccountSessionGet` for consistency with existing API naming scheme.

[Breaking] Renamed `bank_income` to `report` in the `cra/check_report/income_insights/get` response

- [Breaking] For Python only, updated certain fields (primarily ones used by Identity Verification and Monitor) to be represented as string types instead of classes. This is a side effect of a broader change to remove `minLength` verification to work around incorrect behavior in the Ruby client library when receiving `nil` for a type with a `minLength` set. Classes that have been replaced by strings in Python are: `ClientUserID`, `ClientUserIDNullable`, `DeprecatedClientUserID`, `EntityWatchlistScreeningName`, `EntityWatchlistScreeningProgramName`, `GenericCountryCode`, `GenericCountryCodeNullable`, `IdentityVerificationDocumentCountryCode`, `IndividualWatchlistScreeningProgramName`, `ReviewComment`, `SourceUID`, `WatchlistScreeningDocumentValue`, `WatchlistScreeningDocumentValueNullable`, and `WatchlistScreeningIndividualName`.

- Add transfer refund event types to TransferEventType enum.

- Added support for the `layer` product.

- Added support for the `/user_account/session/get` API.