Optimize morph serve Command with Caching and DataFrame Previews

[oginokairan]

Describe your changes

This PR addresses issues related to code deprecation and performance improvements.

This pull request introduces the following modifications:

1. Implementation of morph serve Cache:

• Introduced caching mechanisms in the morph serve command to enhance performance.
• Enabled DataFrame preview in the output of morph serve and morph run command.

2. Refactoring and Removal of Deprecated Files:

• Eliminated obsolete files and functionalities to streamline the codebase.
• Refactored existing code to improve maintainability and readability.

GitHub Issue Link (if applicable)

How I Tested These Changes

• Executed the morph serve command locally to verify the caching and expiring functionality and ensured that responses are returned promptly. i.e., using cached result on second access.
• Ran the morph serve command locally to ensure the DataFrame preview mechanism is working as expected.

Additional context

• These changes aim to enhance user experience by improving the performance and maintainability of the morph serve command.