feat: import public non-asset URL

[sapphi-red]

Description

Add support for import '/foo.json?url' (foo.json is in public directory) and improve errors for importing .json in public directory.

	behavior after this PR	behavior before this PR
import foo from '/public/foo.json'	warning (foo is the content of foo.json)	warning (foo is the content of foo.json)
import foo from '/public/foo.json?url'	warning (foo is the URL of foo.json)	warning (foo is the URL of foo.json)
import foo from '/foo.json'	error	error
import foo from '/foo.json?url'	no error (foo is the URL of foo.json)	error

close #13284

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
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• Ideally, include relevant tests that fail without this PR but pass with it.

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