Add state search spec

spec/requests/api/v1/parks_spec.rb

@@ -17,6 +17,11 @@ RSpec.describe "Api::V1::Parks", type: :request do
       )
     end
 
+    it "filters by state" do
+      get api_v1_parks_url, params: { state: "OR" }
+      expect(response.parsed_body.pluck("code")).to eq(["crla"])
+    end
+
     context "with pagination" do
       it "respects page size param" do
         get api_v1_parks_url, params: { per_page: 1 }