New interface to accept symfony dumb object into graphiql tab panel

[viniciusrangelfp]

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Documented?	yes
License	MIT

This PR helps to debug Symfony application using graphiql bundle.

I am using Graphiql footer to inject Symfony dump objects to react graphiql tab panel.
I had to use this strategy because i can't change React Graphiql tab result.

Its no need any extra configuration since graphql resolver sends an object as result, if we got a string i will inject outside react GraphiQL component.

Also, this PR allows you using a custom variable inside twig to put your custom logo inside GraphiQL.

You can change your logo using a custom variable on twig file.

{# templates/GraphiQL/index.html.twig #}
{% set logoPath = 'https://mylink.com/images/logo.png' %}

You can also work with local images You can change your logo using a custom variable on twig file.

{# templates/GraphiQL/index.html.twig #}
{# move the file mylogo.png to public folder #}
{% set logoPath = 'mylogo.png' %}