refactor: remove util package

[siyul-park]

This pull request aims to streamline the codebase by eliminating the util package and enhancing the data handling capabilities in the primitive package.

Changes Made

1. Removal of util Package:

   • The util package has been entirely removed from the project as its functionalities are now covered by the more versatile and widely-used https://github.com/samber/lo package.

2. Improved Comparison in primitive:

   • The primitive package now supports native comparison in place of the previous implementation. This not only enhances efficiency but also simplifies the codebase.

3. Transition to Ordered Map:

   • The hash map in the primitive package has been replaced with an ordered map, contributing to more predictable iteration and ordering of elements.

4. Elimination of Unnecessary Hash Support in primitive:

   • Given the enhancements in native comparison, the support for hash in the primitive package has been removed, eliminating unnecessary redundancy.

These changes collectively aim to improve code maintainability, reduce redundancy, and leverage widely accepted practices in the Go ecosystem. Please review the modifications and provide your feedback.