Enable whole_program compilation for SnarkyJS

[mrmr1993]

This PR tinkers with some dune flags to allow us to compile SnarkyJS in whole_program mode. This reduces the size of snarky_js_node.bc.js to 5.1 MB.

This is the spiritual successor to #11103, but is actually in a mergeable state.

$ ls -Alh _build/default/src/lib/snarky_js_bindings/snarky_js_node.bc.js
-r--r--r-- 1 matthew matthew 5.1M Jun  3 04:48 _build/default/src/lib/snarky_js_bindings/snarky_js_node.bc.js

Checklist:

• Modified the current draft of release notes with details on what is completed or incomplete within this project
• Document code purpose, how to use it
  • Mention expected invariants, implicit constraints
• Tests were added for the new behavior
  • Document test purpose, significance of failures
  • Test names should reflect their purpose
• All tests pass (CI will check this if you didn't)
• Serialized types are in stable-versioned modules
• Does this close issues? List them

[mrmr1993]

This works perfectly for me locally, but for some reason CI is still choking on it..

[mrmr1993]

Okay, CI should be happy now

[mitschabaude]

Awesome!