Make the SessionBegan interaction easy to identify

[ValentinTrinque]

When the frontend receives a SesionBegan interaction, it doesn't know what workflow is targeted. This prevents the wallet UIs to adapt their displays, which stifle the user experience opportunities.

So we need to add a workflow field (string) to help the front end identify the session that began:

• 'WALLET_CONNECTION' in the client.connect_wallet method
• 'TRANSACTION_REVIEW' in the client.<send|sign|check>_transaction methods
• 'PERMISSION_REQUEST' in the client.list_keys method

[notbot00]

just for the record, i've started coding this on the frontend. ideally i would need this workflow field on every interaction event emitted, so i can keep track of them easily. the traceID itself is not enough anymore for this.