Add support for experimental_requestInfo

[cb-jake]

Summary

This PR adds support for the experimental experimental_requestInfo method to the Account SDK, enabling applications to request user profile information such as name, email, phone number, and physical address.

Changes made:

• Added experimental_requestInfo method support in the Signer class
• Added generic handling for all experimental methods (methods starting with experimental_)
• Created test app components to demonstrate the new functionality
• Added UI section for "Base Profile" methods in the test app

Key files modified:

• packages/account-sdk/src/sign/base-account/Signer.ts - Core signer logic
• examples/testapp/src/components/RpcMethods/method/experimentalMethods.ts - Method definition
• examples/testapp/src/components/RpcMethods/shortcut/experimentalShortcuts.ts - UI shortcuts
• examples/testapp/src/pages/index.page.tsx - Test app integration

How did you test your changes?

Testing performed:

• ✅ Verified the new experimental_requestInfo method is properly routed to popup
• ✅ Confirmed all experimental methods (those starting with experimental_) are handled generically
• ✅ Tested the test app UI displays the new "Base Profile" section correctly
• ✅ Validated the method accepts the expected parameters (requests array with type and optional fields)
• ✅ Confirmed backward compatibility - existing methods continue to work as expected

Test scenarios covered:

• Request info with different combinations of required/optional fields (name, email, phoneNumber, physicalAddress)
• Verified popup integration works correctly for the new experimental method
• Ensured the generic experimental method handler doesn't interfere with existing functionality

[cb-heimdall]

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