feat: improve message formatting in NewCodeErrWithMsg function

[fmyAgi7]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request refines the error message formatting within the NewCodeErrWithMsg function by adopting the golang.org/x/text/cases package for title casing. This change ensures that error messages are capitalized more accurately and consistently. A corresponding test has been added to validate the new formatting behavior.

Highlights

• Improved Error Message Formatting: The NewCodeErrWithMsg function now uses golang.org/x/text/cases for title casing error messages, replacing the simpler strings.ToTitle. This provides more robust and linguistically accurate capitalization.
• New Imports: The errors/err_code.go file now imports golang.org/x/text/cases and golang.org/x/text/language to support the enhanced message formatting.
• New Test Case: A new test, TestNewCodeErrWithMsg, has been added to errors/z_err_code_test.go to verify that the NewCodeErrWithMsg function correctly applies title casing to error messages (e.g., 'hello world' becomes 'Hello World').

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[gemini-code-assist]

Code Review

This pull request correctly replaces the deprecated strings.ToTitle with the recommended golang.org/x/text/cases package for title-casing error messages. However, I've identified a performance issue in the implementation where a cases.Caser is created on each call, which should be a package-level singleton. Additionally, the new test has a critical flaw where it can panic due to a nil pointer dereference. My comments provide details and suggestions for fixing these issues.