Add graphql base types

app/graphql/mutations/base_mutation.rb

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+module Mutations
+  class BaseMutation < GraphQL::Schema::Mutation
+  end
+end

app/graphql/types/base_enum.rb

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+module Types
+  class BaseEnum < GraphQL::Schema::Enum
+  end
+end

app/graphql/types/base_input_object.rb

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+module Types
+  class BaseInputObject < GraphQL::Schema::InputObject
+  end
+end

app/graphql/types/base_interface.rb

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+module Types
+  module BaseInterface
+    include GraphQL::Schema::Interface
+  end
+end

app/graphql/types/base_object.rb

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+module Types
+  class BaseObject < GraphQL::Schema::Object
+  end
+end

app/graphql/types/base_scalar.rb

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+module Types
+  class BaseScalar < GraphQL::Schema::Scalar
+  end
+end

app/graphql/types/base_union.rb

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+module Types
+  class BaseUnion < GraphQL::Schema::Union
+  end
+end

app/graphql/types/url.rb

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+module Types
+  class URL < Types::BaseScalar
+    description "A valid URL, transported as a string"
+
+    def self.coerce_input(input_value, context)
+      url = URI.parse(input_value)
+      if url.is_a?(URI::HTTP) || url.is_a?(URI::HTTPS)
+        url
+      else
+        raise GraphQL::CoercionError, "#{input_value.inspect} is not a valid URL"
+      end
+    end
+
+    def self.coerce_result(ruby_value, context)
+      ruby_value.to_s
+    end
+  end
+end