Admin jb

[janilya]

• [ ] Expanded the FE: added input fields to create new topics, write to topics, and read from topics
• [ ] Refactored the server BE: created appropriate routes to admin (to create topics and list all the topics), producer, and consumer instances
• [ ] Implemented caching to avoid quering the kafka admin for all the topics to be displayed on the FE
• [ ] Modularized topic selection

Fixes #31

[adam-thibodeaux]

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