JavaScript: Split JS DSL into Saturated and Unsaturated

Closed doyougnu requested to merge doyougnu/ghc:wip/doyougnu/js/split-unsat into master

This is the first in a series of MRs related to !10000 and #22736 . Instead of merging that MR first we decided to split the DSL, isolate the binary and outputable instances (so the codegen) to a new IR that does not have the concept of Saturation. This is all in an effort implement the GHCJS optimizer in a safer maintainable way. See #22736 for the rest of the roadmap.

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