Introduction

Moving most of the code related to generate helper functions for custom lower / raise of associated values in enums to dedicatedIntrinsicJSFragment and moving toCodeFragmentPrinter instead of "manual" code generation management.
Similar update done forsimple,raw type enums and namespaces.

Notes

I've also started migrating some code fromBridgeJSLink to use fragment printer, but I'll post another PR for clarity, as it's not related to enums and I'd rather keep PRs smaller when possible (which is harder to do when adding new functionality with tests)