[WIP][TASK] Support JavaScript invoke instruction on exported functions

Allow for empty invoke() JavaScriptModule instructions which
causes the module export to be invoked as plain function.
The method must not be called with the ES6 module passed
as this-value.

Resolves: #
Releases: main
Change-Id: I5e2f8c5b7c0f617f5ea7f1cf8ae1a6843187515f
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