Adds support for serializing lambdas which are
properties of captured objects.
For example:
```
let o = {
f: () => 12
};
let func = new aws.serverless.Function("func", {policies: [aws.iam.AWSLambdaFullAccess]}, (ev, ctx, cb) => {
console.log(o.f());
cb(null, null);
});
```
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