Make JsonParser escape character parsing more strict

[Genteure]

This is a continuation of #1160

This PR removes support for non-standard \v, \x00, \0123 and \(any char here), and will throw an error instead.

This behavior is matching other common JSON parser like JSON.parse found in nodejs.

// node v16.13.0
JSON.parse('{"\\v":1}')
// Uncaught SyntaxError: Unexpected token v in JSON at position 3

// Newtonsoft.Json 13.0.1
const string json = @"{""\v"":1}";
var obj1 = Newtonsoft.Json.JsonConvert.DeserializeObject(json);
// Newtonsoft.Json.JsonReaderException: Bad JSON escape sequence: \v. Path '', line 1, position 4.

[lahma]

I like when things get simpler!