fix(json_formatter): handle comments in empty arrays/objects

[faultyserver]

Summary

Fixes #1322. Comments within empty object and array values are now placed as dangling comments, which those nodes then handle formatting for directly to place them within the braces for the value. For example:

{
    "object-block": { /* here's a block comment */},
    "object-line": { // here's a line comment
    },
    "object-ownline": {
        /* here's a block comment */
        // and a line comment
    }
}

// Now becomes

{
	"object-block": {
		/* here's a block comment */
	},
	"object-line": {
		// here's a line comment
	},
	"object-ownline": {
		/* here's a block comment */
		// and a line comment
	}
}

Test Plan

Added a snapshot test to cover various permutations of comments in empties.

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[faultyserver]

This should_expand wasn't here before, but since the only way Dangling comments get added is explicitly through the handler that checks for empty blocks, I believe it's safe to add and won't change any other existing formatting.

[Conaclos]

It could be worth adding a changelog entry.