[code2fn] Support for decorators (Python)

[myedibleenso]

No description provided.

[cl4yton]

Need to dig into general Python support for decorators:

• how decorators are defined: what is the syntax for creating the definition of a decorator, and the python model for what this implies
• how decorators are applied: the @ notation, parameterization; what is the python definition for how decorators are executed.

We believe there are three general cases to handle:

• built-in decorators: we likely do not have access to the decorator definition, so would need to add support on case-by-case basis.
• decorators that are defined in code but for which we do not have access to their definition. How might this happen? --> the implementation is in compiled library or other language? Need a general method to appropriately "black box" in the FN.
• decorators that are defined in code and we do have access to their definition: if we have a general method to interpret the decorator definition and instances of it being applied, then we should be able to fully represent in the FN.