Schema Processing doesn't handle GQL String-Literal Descriptions

[darthtrevino]

Description

A part of the latest GraphQL Specification is string literal descriptions on schema elements. This is meant to aid developers grok a schema when using interactive tools (http://spec.graphql.org/June2018/#sec-Descriptions).

When processing a gql schema using Schema.For(readSchemaGqlFile()), the library throws an error on description fields.

Steps to reproduce

Use a description field in a GQL file

Query {
   """
   get the things
   """ 
   things: [Thing!]!
}

Expected result

The descriptions should not cause the schema read to throw an exception.

Actual result

An exception is thrown

Environment

Windows 10, Azure Functions,

[sungam3r]

See graphql-dotnet/parser#33

[darthtrevino]

Gotcha, thanks

[darthtrevino]

Feel free to close as dupe

[Shane32]

Duplicate of #1640