Steam Login

[0xFirekeeper]

PR-Codex overview

This PR introduces support for the Steam authentication provider in the InAppWallet functionality, updating relevant files to accommodate this addition.

Detailed summary

• Added Steam to the list of authentication providers in InAppWallet.Types.cs.
• Commented out the Google auth provider in Program.cs and replaced it with Steam.
• Included Steam in the mapping of AuthProvider in EcosystemWallet.cs.
• Updated the LinkAccount method to handle Steam as a valid case.

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