fix: add runtimeOptions

[UziTech]

Allow runtimeOptions with runtimeOptions option in render options and config options.

This allows you to change this:

const express = require('express')
const expressHandlebars = require('express-handlebars')
const Handlebars = require('handlebars')
const {allowInsecurePrototypeAccess} = require('@handlebars/allow-prototype-access')

const hbs = exphbs.create({
  defaultLayout: 'main', 
  extname: 'hbs',
  handlebars: allowInsecurePrototypeAccess(Handlebars)
});
...

to this:

const express = require('express')
const expressHandlebars = require('express-handlebars')

const hbs = exphbs.create({
  defaultLayout: 'main', 
  extname: 'hbs',
  runtimeOptions: {
    allowProtoPropertiesByDefault: true,
    allowProtoMethodsByDefault: true
  }
});
...

fixes #16
fixes handlebars-lang/handlebars.js#1648 (comment)
fixes handlebars-lang/handlebars.js#1642 (comment)

[github-actions]

🎉 This PR is included in version 4.0.6 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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