Added fecthUserbalance function

Feature Merge Request

Related Issue

resolves #286 (closed)

Description of Feature

wrote a function: fetchUserBalance()

adjusted processEvent() in assessmentActions to call it upon

- notificationTopic.AssessmentCreated

- notificationTopic.ConfirmedAsAssessor

- notificationTopic.TokensPaidOut

Motivation and Context

discovering this is not updated as we finish assessment creation

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