feat: add error types for better validation

[plusiv]

Description:

This PR improves error handling by adding specific error types and ensuring compatibility with errors.Is for better validation. The changes include:

• Introduced custom error types:
  • ErrInvalidUUIDFormat
  • ErrInvalidURNPrefix
  • ErrInvalidBracketedFormat
  • ErrInvalidLength
• Refactored error handling to use the new error types.
• Updated the Parse, ParseBytes, and Validate functions to wrap errors with additional context using fmt.Errorf and %w.
• Ensured backward compatibility by maintaining the IsInvalidLengthError function.

[bormanp]

I understand what you are trying to do and overall it seems like a worthy idea.

Given the number of packages that include this package I am rather paranoid about any functional change. I don't mind the custom error becoming public as that is an addition and changes nothing.

[plusiv]

Hi @bormanp , I really appreciate your review and valid suggestions. I've removed some changes that were added unintentionally by my code formatter in my code editor. Additionally I've sightly modified the approach with ErrInvalidLength and ErrInvalidURNPrefix error types to keep more backward compatibility.