Fix lagging issues when using two way data bind

[dkarkanas]

When we are using json schema form with the following sytnax, we realized the UI was lagging because of an infinite loop triggered/triggering ngOnChanges.

<json-schema-form
                    [schema]="schema"
                    [(data)]="data"
                    [layout]="layout"
                    [framework]="framework"
                    [options]="jsonFormOptions"
                    [widgets]="widgets"
                    (onChanges)="onFormChanges($event)"
                    (isValid)="isValid($event)"
                    (onSubmit)="onSubmit($event)">
</json-schema-form>

Adding a condition for checking the equality of previous and current value, fixes the infinite loop.

if (changes.data && isEqual(changes.data.previousValue, changes.data.currentValue)) {      
      return;
}

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