ENHANCEMENT: Inconsistent sort order of children elements during marshalling

[tpoxa]

Marshaling of the same node returns a list of children nodes in a different order.

Possibly because of the range over a map of children here:

https://github.com/spyzhov/ajson/blob/master/encode.go#L66

[spyzhov]

Hello, based on the JSON description:

An object is an unordered set of name/value pairs.

https://www.json.org/json-en.html

Adding the force ordering into it will add unnecessary load.

I will add some additional configs, but it's not a bug.