Generated trampoline treats resource methods as free functions

[ritalin]

Related to #1314, but this focuses on incorrect code generation for methods.

When importing a JS class as a WIT resource, the generated code in the trampoline appears to be incorrect.

Current generated code:

foo?._isHostProvided = true;
...

await foo(arg);

Observation:

• A runtime error occurs when calling the method
• The generated code attempts to call the method as a free function

This suggests the generated code does not preserve the method context (this).

Workaround:
The generate code should call the method on the resource instance instead of treating it as a free function.

let hostProvided = false;
hostProvided = rsc0.constructor._isHostProvided;

...

await rsc0.foo(arg);

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Full discussion (including context and workaround):
#jco > Unexpected error when using async JS types/functions with im