fix: improve the way of handling same type

[Zolyn]

Description

Bug fixes

• Extract the interface itself even it is referenced in a property. Reason: We just extract an empty interface when it is referenced in a property at the moment. This may lead to wrong result because we cannot determine which types this type is referenced by.
• Improve the way of changing name to the already extracted's when types imported implicitly depends on same types
• Improve the way of handling duplicate imports/exports
• Improve the way of finding types
• Fix infinite loop when the type references itself (see caveats in README.md)
• Do not remove import when extracting enum types referenced from SFC, closes #20
• Fix noisy warnings

Other changes

• Add comment /* enum */ and /* empty-enum */ when extracting enum types
• Use process.env.VITEST instead of import.meta.vitest
• Update deps
• Update docs

[Zolyn]

@wheatjs I think we can do a release after this PR merges

[wheatjs]

Awesome, thanks! I'll give it a quick review when I get home and we can do a release!

[Zolyn]

Done. @wheatjs