fix: re-import duplicate, request name, and localhost with port #5

[boydaihungst]

• Fix localhost. #2
• Cache user input URL
• Rename request from operation_{mutation,query} -> operation
• Fix duplicated after re-import

[gatzjames]

Thanks 🙏 this looks amazing! Didn't have time to test it yet but caching and duplicate handling looks great! 👍

[s-takehana]

@gatzjames Is there any update on this? I can't use this awesome plugin.