Feature: add an optional callback containing all sanitised values

[RobTheFiveNine]

Currently, there is an optional callback that can be specified (onClean) which will be called every time a value is sanitised. There may, however, be scenarios in which a callback would be preferred which is invoked once after the entire process is finished.

This callback would contain an array of objects that detail the same information as the existing callback for each sanitisation that occurred (object path, key, value).

In practise, its usage by the end user should look something like this:

const express = require('express');
const nosqlSanitizer = require('express-nosql-sanitizer');

const app = express();
app.use(nosqlSanitizer({
  onClean: (objectPath, key, value) => {
    console.log('A single item has been sanitised');
    console.log(objectPath, key, value);
  },
  onComplete: (sanitizations) => {
    console.log('All items have been sanitised');
    sanitizations.forEach((s) => {
      console.log(s.objectPath, s.key, s.value);
    });
  },
}));