refactor: error handling for the schema controller & added global exception handler

[KulkarniShashank]

What

Refactors the error handling for the schema controller and introduces a global exception handler to improve error management throughout the application.

Why

Improved error handling is crucial for maintaining code quality and ensuring robustness. By refactoring the error handling for the schema controller and adding a global exception handler.

How

Refactored error handling logic in the schema controller to adhere to best practices and improve readability. Implemented a global exception handler to centrally manage exceptions and streamline error reporting across the application.

[sonarqubecloud[bot]]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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[GHkrishna]

Closing this as DCO failed for this PR, raised #130