Add @post_pipe

[skrawcz]

Is your feature request related to a problem? Please describe.
@pipe is nice, but can be a little counter-intuitive to read. i.e. the function parameter declares the dependency, is then modified by @pipe and then passed into the function.

Describe the solution you'd like
@post_pipe would be the opposite of @pipe. The function would declare the dependency, the body of the function would run, and then the @post_pipe steps would run after the function.

@post_pipe(# these run after the function is run.
    step(_transform_1, v=1),
    step(_transform_2, v=2),
)
def A_processed(A: pd.DataFrame) -> pd.DataFrame:
    return A # original A -- could do modifications here.

Describe alternatives you've considered
N/A

Additional context

[elijahbenizzy]

@skrawcz this is a duplicate #701