mitosheet.sheet(dfs[0]) leads to execution error on every edit event

[aarondr77]

1. Run this code

import pandas as pd
import mitosheet

dfs = [pd.DataFrame({'A': [1,2,3]})]
mitosheet.sheet(dfs[0])

2. Add a column
3. Get this execution error

  File "add_column.py", line 48, in execute
    return cls.execute_through_transpile(
  File "step_performer.py", line 156, in execute_through_transpile
    exec(final_code, exec_globals, exec_locals)
  File "<string>", line 1, in <module>
NameError: name 'dfs' is not defined

[naterush]

Ok -- so there's some complexity in getting this to work. Namely, we can handle this in the args update (e.g. just turning this into df -- but we also need to handle it in the transpiler as well. And then there's the code that is parameterized.

Part of me thinks args update should almost just be a step in it's own right?