Changes:
- When checking if a table is a function table, check for subtyping to
  funcref instead of equality.
- Add WasmModuleObject argument to GetFunctionTableEntry.
- Implement WasmTableObject::Get/Set for all legal table types.
- Factor out SetFunctionTableEntry from WasmTableObject::Set.
- Write unittests and JS tests.

Bug: v8:9495
Change-Id: I4f0c7a7013f17c561afb3039c5e0811634a4d313
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2416387
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70032}