Fix: Add use case other modules in content script

[Jonghakseo]

• Feature Request: Allow module imports in content scripts #160 (comment)

There is an issue with using import in content/index.ts due to module unsupport in the Chrome extension. As a workaround, We can manage dependencies inside other modules that use import(). However, this is not visible in the code, making it difficult for users to recognize, so I've added a use case.

Other changes

• Cleaned up dynamic import plugin code

[PatrykKuniczak]

@Jonghakseo That's interesting workaround, if i want to run func under condition, i can use this import inside if statement, then this self invoked func is used from e.g 'injected' run when i want it