Use fast-json-escape for string serialization

[ivan-tymoshenko]

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Issue

@BridgeAR has a nice fast-json-escape package that allows you to escape string for JSON format. It's a better implementation than ours because it doesn't have a fallback to the standard JSON.stringify that we have here. However, we need to add some adjustments to support surrogate pairs escaping. @BridgeAR already has an implementation like we need this.

I created a PR a few months ago, but it's still awaiting a response.

@mcollina What is the correct solution in this case? Should we copy the code and put in a license? From the other point of view, the code I want to copy is not a fresh idea. It's a strict implementation of the JSON spec.

[BridgeAR]

I just released v2.0.0 that supports surrogate pairs. While checking the code, I noticed that the JSON.stringify got much faster escaping strings by now than in Node.js versions <= 10. It is now better to use JSON.stringify directly for escaping values, in case that's needed for the string.

[ivan-tymoshenko]

That you for releasing a new version and for the hint. I will check the default JSON.stringify performance for this case.