Refactor RCComponent useEffects

[iam-vipin]

Acceptance Criteria fulfillment

• [x] Combine three useEffect hooks into one
• [x] Set toast bar position and avatar state using store hooks
• [x] Check if the user is authenticated using the setIsUserAuthenticated hook
• [x] Verify that code behavior is not affected

Fixes #132 Task 9

[abhinavkrin]

@VipinDevelops Thanks for this PR. I do have one question that should we fetch user details when props like toastPosition, showAvatar etc changes? Tagging @sidmohanty11.