use ParserInterface in GraphController constructor instead of parser classes

[vbelorus]

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

Hi there.
I think using interfaces in __construct parameters will be better. I want to override parser but cannot do that without this changes.

Test not passed with and without my changes.

RuntimeException: Type class for alias "RootQuery" could not be load. If you are using your own classLoader verify the path and the namespace please.
Class 'Overblog\GraphQLBundle\Access\__DEFINITIONS__\RootQueryType' not found

ERRORS!
Tests: 254, Assertions: 492, Errors: 10.

Remaining deprecation notices (1)

Autowire custom tagged (type, resolver or mutation) services is deprecated as of 0.9 and will be removed in 1.0. Use AutoMapping or set it manually instead: 1x
    1x in ResolverTaggedServiceMappingPassTest::testCompilationWorksPassConfigDirective from Overblog\GraphQLBundle\Tests\DependencyInjection\Compiler

[mcg-web]

LGTM, thank you @vbelorus.

[vbelorus]

@mcg-web thanks