Add current benchmarks, new benchmark List[T].indexOfOpt with variants

testcases/synthesis/PrimeHeuristic.scala.off

testcases/synthesis/archives/ADTInduction.scala

testcases/synthesis/archives/BinaryTree.scala

testcases/synthesis/archives/CegisExamples.scala

testcases/synthesis/archives/CegisFunctions.scala

testcases/synthesis/archives/ChooseArith.scala

testcases/synthesis/archives/ChooseIneq.scala

testcases/synthesis/archives/ChoosePos.scala

testcases/synthesis/archives/ChurchNumerals.scala

testcases/synthesis/archives/DrSuter.scala

testcases/synthesis/archives/FastExp.scala

testcases/synthesis/archives/FiniteSort.scala

testcases/synthesis/archives/Injection.scala

testcases/synthesis/archives/InnerSplit.scala

testcases/synthesis/archives/Justify.scala

testcases/synthesis/archives/Matching.scala

testcases/synthesis/archives/ScaleWeight.scala

testcases/synthesis/archives/Sec2Time.scala

testcases/synthesis/archives/SimplestCegis.scala

testcases/synthesis/archives/Spt.scala