Allow arguments to be deprecated

This uses the same deprecation syntax as for fields.

app/graphql/resolvers/base_resolver.rb

@@ -6,6 +6,8 @@ module Resolvers
     include ::Gitlab::Utils::StrongMemoize
     include ::Gitlab::Graphql::GlobalIDCompatibility
 
+    argument_class ::Types::BaseArgument
+
     def self.single
       @single ||= Class.new(self) do
         def ready?(**args)

app/graphql/types/base_argument.rb

+# frozen_string_literal: true
+
+module Types
+  class BaseArgument < GraphQL::Schema::Argument
+    include GitlabStyleDeprecations
+
+    def initialize(*args, **kwargs, &block)
+      kwargs = gitlab_deprecation(kwargs)
+      kwargs.delete(:deprecation_reason)
+
+      super(*args, **kwargs, &block)
+    end
+  end
+end

app/graphql/types/base_field.rb

@@ -5,6 +5,8 @@ module Types
     prepend Gitlab::Graphql::Authorize
     include GitlabStyleDeprecations
 
+    argument_class ::Types::BaseArgument
+
     DEFAULT_COMPLEXITY = 1
 
     def initialize(*args, **kwargs, &block)