JS Backend add simple optimizer

This MR changes some simple optimizations and is a first step in re-architecting the JS backend pipeline to add the optimizer. In particular it:

• removes simple peep hole optimizations from GHC.StgToJS.Printer and removes that module
• adds module GHC.JS.Opt
• defines the same peep hole opts that were removed only now they are Syntax -> Syntax transformations rather than Syntax -> JS code optimizations
• hooks the optimizer into code gen

Working Ticket:

• #22736

Related MRs:

• MR !10142 (closed)
• MR !10000

Left before ready:

• squash with good commit message
• CI passes
• Cleanup and docs inGHC.JS.Optimizer

--- Post review

• remove unsafe ops
• alter code gen to generate the right code (For instead of While, FuncStat instead of var func..)
• use CPS style