This is a reland of f902ef32

Original change's description:
> [wasm] Cleanup wasm script creation
> 
> - Do not expose CreateWasmScript since we should now use
> WasmEngine:GetOrCreateScript instead,
> - Initialize all Script fields in CreateWasmScript, not in
> WasmModuleObject::New,
> - Do not pass code size estimate argument, since we can always use the
> actual native module's committed code space.
> 
> R=clemensb@chromium.org
> 
> Bug: v8:10349
> Change-Id: If9250d62ffc271ab6efc3b9c45958a305c9d1827
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2135633
> Reviewed-by: Clemens Backes <clemensb@chromium.org>
> Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67083}

Bug: v8:10349
Change-Id: I38c8b6beb07a1e5d565c6a5fd749daea147817bb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2144064Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67087}