UI Refactoring of Create Schema Page

[16-karan]

• [x] Development of new UI
• [x] Responsiveness
• [x] Dark and Light mode
• [x] Testing for initial functionality

Enhancements and fixes:

• [x] UI updation for dark/light mode
• [x] Disable the "Add attribute" button
• [x] Show confirmation popup on reset button click
• [x] Auto-populate "attribute name" in the "display name" input field while creating schema

[16-karan]

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