feat(language-server): support files that do not exist in FS but are open in the editor for TS project

[johnsoncodehk]

This is a change made for test-utils. The test code can make the TS language server think that a certain file exists through openInMemoryDocument, even if the file does not exist in FS.

Example: https://github.com/vuejs/language-tools/blob/13924d1d2fb8a6f11c267dd4612c366502c1cbc5/packages/language-server/tests/inlayHints.spec.ts#L232

[pkg-pr-new]

commit: ea8b8f9

@volar/eslint

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@volar/jsdelivr

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@volar/kit

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@volar/language-core

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@volar/language-server

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@volar/language-service

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@volar/monaco

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@volar/source-map

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@volar/test-utils

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@volar/typescript

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@volar/vscode

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