Add `method_list` method
Add `method_list` method

Finds all (sub)method objects with specified name on all MRO type
objects.

Perhaps needs a better name.

softmoth/rakudo,tony-o/rakudo,labster/rakudo,labster/rakudo,tony-o/rakudo,softmoth/rakudo,tbrowder/rakudo,softmoth/rakudo,nbrown/rakudo,nbrown/rakudo,tony-o/rakudo,rakudo/rakudo,salortiz/rakudo,tony-o/rakudo,labster/rakudo,labster/rakudo,salortiz/rakudo,rakudo/rakudo,MasterDuke17/rakudo,salortiz/rakudo,MasterDuke17/rakudo,rakudo/rakudo,tony-o/rakudo,rakudo/rakudo,nbrown/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,nbrown/rakudo,softmoth/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,rakudo/rakudo,softmoth/rakudo,labster/rakudo,MasterDuke17/rakudo,salortiz/rakudo,rakudo/rakudo,salortiz/rakudo,tbrowder/rakudo,labster/rakudo,nbrown/rakudo,tbrowder/rakudo,nbrown/rakudo,MasterDuke17/rakudo,salortiz/rakudo,tbrowder/rakudo,tony-o/rakudo