Re: [w3c/clipboard-apis] What should `clipboard.readText()` return when the clipboard contains multiple clipboard items? (Issue #166)

I wrote a quick Objective-C program to dump pasteboard items (and the list of types per item), and tested it out in a couple of scenarios:

```
@import AppKit;
@import UniformTypeIdentifiers;

int main(int argc, const char * argv[]) {
    __auto_type filterDeclaredTypes = [NSPredicate predicateWithBlock:^BOOL(NSString *typeIdentifier, NSDictionary<NSString *,id> *unused) {
        return [UTType typeWithIdentifier:typeIdentifier].declared;
    }];

    [[[NSPasteboard generalPasteboard] pasteboardItems] enumerateObjectsUsingBlock:^(NSPasteboardItem *item, NSUInteger index, BOOL *unused) {
        NSLog(@"Item at index [%zu] contains types: %@", index, [item.types filteredArrayUsingPredicate:filterDeclaredTypes]);
    }];
}
```

When copying 3 files in Finder, I see multiple items (though only the first item has a plain text representation that contains a space-separated list of file paths):

```
2022-02-02 08:26:30.567 PasteboardTest[5673:30388857] Item at index [0] contains types: (
    "public.file-url",
    "public.utf16-external-plain-text",
    "public.utf8-plain-text"
)
2022-02-02 08:26:30.567 PasteboardTest[5673:30388857] Item at index [1] contains types: (
    "public.file-url"
)
2022-02-02 08:26:30.567 PasteboardTest[5673:30388857] Item at index [2] contains types: (
    "public.file-url"
)
2022-02-02 08:26:30.568 PasteboardTest[5673:30388857] Item at index [3] contains types: (
    "public.file-url"
)
```

When copying 3 images from the Photos app, all 3 items correspond to pasteboard items:

```
2022-02-02 08:27:59.027 PasteboardTest[5678:30390067] Item at index [0] contains types: (
    "com.apple.photos.object-reference.asset",
    "public.jpeg",
    "public.file-url"
)
2022-02-02 08:27:59.028 PasteboardTest[5678:30390067] Item at index [1] contains types: (
    "com.apple.photos.object-reference.asset",
    "public.jpeg",
    "public.file-url"
)
2022-02-02 08:27:59.028 PasteboardTest[5678:30390067] Item at index [2] contains types: (
    "com.apple.photos.object-reference.asset",
    "public.jpeg",
    "public.file-url"
)
```

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