adding *args, **kwargs to add_execution, set_after_exec and set_before_exec

[none2003]

Currently, if you want to pass parameters to fn, you must use the pybroker.param method, which is rather inconvenient, eg:

pybroker.param("run_type", "monthly")

def some_exec(ctx):
    run_type = pybroker.param("run_type")
    if run_type:
        if run_type == "monthly":
            pass

So, it will be great if *args, **kwargs can be add to add_execution, set_after_exec and set_before_exec, like:

def add_execution(
    self,
    fn: Optional[Callable[[ExecContext], None]],
    symbols: Union[str, Iterable[str]],
    models: Optional[Union[ModelSource, Iterable[ModelSource]]] = None,
    indicators: Optional[Union[Indicator, Iterable[Indicator]]] = None,
    *args, 
    **kwargs,
):

these extra args can later be passed to fn directly and then referenced within fn, thereby increasing the flexibility of fn.

For example:

strategy.add_execution(some_exec, symbols, indicators=[inv_vol], run_type="monthly")

def some_exec(ctx, run_type):
    if run_type:
        if run_type == "monthly":
            pass

set_after_exec and set_before_exec can also be handled in the same way.

[edtechre]

Thanks for the suggestion @none2003, I will add this for the next release.