* challenger: Create generic vm executor and use for asterisc

* challenger: Move executor utils to vm package

* challenger: Switch cannon to use common vm executor.

* challenger: Use vm.Config to encapsulate Cannon config items.

* challenger: Rename to include Path

* challenger: Use vm.Config to encapsulate Asterisc config items.

* challenger: Remove unused interface

* challenger: Reduce amount of config passed to cannon/asterisc trace providers

* challenger: Remove Config from names

* challenger: Remove replaced cannon metrics