This adds support for properly importing {WebAssembly.Function} objects
that were constructed in JavaScript and just wrap a JavaScript callable.

R=ahaas@chromium.org
TEST=mjsunit/wasm/type-reflection
BUG=v8:7742

Change-Id: I00e01db0d85b83d405eb28517d00fba62c253985
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1690949
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62641}