build(package.json): create build scripts
build(package.json): create build scripts

* Add a clean task.
* Run clean task prebuild
* Run build task pretest
* Run test preversion
* Run conventional changelog on version
* Run `npm publish`, `git push` and `git push --tags` postversion

mthmulders/stryker-jest-runner,mthmulders/stryker-jest-runner,mthmulders/stryker-jest-runner