Fix wasm bindings for go 1.19

[JustusFT]

There was some changes to the js package between go 1.16 and 1.19. The Wrapper interface was removed in go 1.18 so the js side is not able to use the Promise type. To fix this, I changed the function to return a js.Value directly.

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Code Review Checklist (to be filled out by reviewer)

• Description accurately reflects what changes are being made.
• Description explains why the changes are being made (or references an issue containing one).
• The PR appropriately sized.
• New code has enough tests.
• New code has enough documentation to answer "how do I use it?" and "what does it do?".
• Existing documentation is up-to-date, if impacted.