When federating an account, set the new variable Account.wallet to be…

[BellringerQuinn]

… the target wallet address. Then, when federation success event is emitted, we update the email address associated with the wallet and save this to secure storage (if enabled and supported on the target platform). This allows us to get the user's email after federating the account and to get it in subsequent sessions that are recovered

@andygruening this should address this issue experienced by TapNation https://github.com/0xsequence/issue-tracker/issues/4761

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