fix hide notifications

[andrewinci]

• move save text to hook
• add notification hook
• use notification hook instead of free notification functions
• wrap setConsumerGroup in a hook
• move getConsumerGroupState to the admin hook
• move kafka admin functions into useAdmin
• export useListTopics in a separate hook
• update hooks in admin
• wrap getTopicInfo and getLastOffset into hooks
• show last offset in the consumerner group view
• wip