Add benchmark handling a large file

Author: ahx

benchmarks/apps/large.ru

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+require 'json'
+require 'openapi_first'
+require_relative 'app'
+
+OpenapiFirst.register File.absolute_path('../../spec/data/large.yaml', __dir__)
+
+use OpenapiFirst::Middlewares::RequestValidation
+run App

benchmarks/large.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+require 'benchmark/memory'
+require 'openapi_first'
+
+Benchmark.memory do |x|
+  x.report { OpenapiFirst.load('../spec/data/large.yaml') }
+end