fix: loose strategy when suffer trailing comma in json

[IWANABETHATGUY]

Summary

{
"test", "something",
"another", "something",
}

trailing comma syntax error is a common syntax error when copying and pasting something in the json file, we could lose this kind of syntax error, and give our formatter a chance to format the code, like pretty did.

tools/crates/rome_json_formatter/tests/specs/prettier/json/json/array.json.snap

Lines 23 to 39 in 9bc3f89

	# Prettier differences
	```diff
	--- Prettier
	+++ Rome
	@@ -1 +1,9 @@
	-[[1, null], [1, null], [null], [0], [false], [""]]
	+[
	+ [
	+1,null],
	+ [1,null,],
	+ [null,],
	+ [0,],
	+ [false,],
	+ ['',]
	+]
	```

Test Plan

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• I will create a new PR to update the documentation

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[ematipico]

I am a bit hesitant about this "fix":

• we're not fixing anything, we're actually injecting non-spec changes to a language;
• we can't compare ourselves to prettier in that sense. Rome does work in LSP too, and there might be people that rely on diagnostics even when the formatter is disabled;
• if a JSON file is used by users inside an application and they don't use the formatter, that file will raise an error;

How did you want to introduce this change?