Run validate_request in benchmark

Author: ahx

benchmarks/large.rb

@@ -4,5 +4,9 @@
 require 'openapi_first'
 
 Benchmark.memory do |x|
-  x.report { OpenapiFirst.load('../spec/data/large.yaml') }
+  x.report do
+    oad = OpenapiFirst.load('../spec/data/large.yaml')
+    request = Rack::Request.new(Rack::MockRequest.env_for('/workspaces'))
+    oad.validate_request(request)
+  end
 end