Chore: deprecate iframe (#4991)

## Problem solved

Short description of the bug fixed or feature added

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## PR-Codex overview
This PR focuses on deprecating two authentication strategies in the `types.ts` file related to in-app wallets. The strategies for `iframe_email_verification` and `iframe` are marked as deprecated, which indicates they should not be used in future implementations.

### Detailed summary
- Added `@deprecated` comment to the `iframe_email_verification` strategy.
- Added `@deprecated` comment to the `iframe` strategy.

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Author: gregfromstl

packages/thirdweb/src/wallets/in-app/core/authentication/types.ts

@@ -36,8 +36,19 @@ export type SingleStepAuthArgsType =
   | SocialAuthArgsType
   | { strategy: "jwt"; jwt: string; encryptionKey: string }
   | { strategy: "auth_endpoint"; payload: string; encryptionKey: string }
-  | { strategy: "iframe_email_verification"; email: string }
-  | { strategy: "iframe" }
+  | {
+      /**
+       * @deprecated
+       */
+      strategy: "iframe_email_verification";
+      email: string;
+    }
+  | {
+      /**
+       * @deprecated
+       */
+      strategy: "iframe";
+    }
   | {
       strategy: "passkey";
       /**