Fix uint64 comparing in JS

[mitschabaude]

Explain your changes:

• This PR fixes broken uin64 comparison in integer_stubs_js, as documented and explained here: Compare does not work because we are using int64 o1-labs/integers_stubs_js#1
• The strategy is to change the uint64 from being the same as int64, to be a wrapper around int64

Explain how you tested your changes:

• Verified manually that this fixes uint64 comparison

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

• Closes #0000