Added a benchmark for sexp
Added a benchmark for sexp

dg-ratiodata/cucumber-ruby,cucumber/cucumber-ruby,enkessler/cucumber-ruby,shadow000902/cucumber-ruby,marxarelli/cucumber,jarib/cucumber,dg-ratiodata/cucumber-ruby,martinma4/cucumber-ruby,marxarelli/cucumber,sideci-sample/sideci-sample-cucumber,CW5000/CWFDerpy,enkessler/cucumber-ruby,jasonkarns/cucumber-ruby,richarda/cucumber,jasonkarns/cucumber-ruby,nfredrik/cucumber-ruby,cucumber/cucumber-ruby,martinma4/cucumber-ruby,CW5000/CWFDerpy,sideci-sample/sideci-sample-cucumber,danascheider/cucumber-ruby,richarda/cucumber,phoebeclarke/cucumber-ruby,twalpole/cucumber,tom025/cucumber,jasonkarns/cucumber-ruby,enkessler/cucumber-ruby,dchelimsky/cucumber,tom025/cucumber,brasmusson/cucumber,phoebeclarke/cucumber-ruby,jarib/cucumber,brasmusson/cucumber,danascheider/cucumber-ruby,shivashankar2020/mands,twalpole/cucumber,cucumber/cucumber-ruby,jarib/cucumber,dg-ratiodata/cucumber-ruby,shadow000902/cucumber-ruby,dchelimsky/cucumber,shivashankar2020/mands,tom025/cucumber,nfredrik/cucumber-ruby,shivashankar2020/mands