add: Custom arguments with custom cond

[Miksus]

Now one can pass arguments when using a custom condition.

Now this should work:

from pathlib import Path

@app.cond()
def file_exists(file):
    return Path(file).exists()

@app.task(file_exists("myfile.csv"))
def do_things():
    ...

[codecov-commenter]

Codecov Report

Base: 95.50% // Head: 95.50% // No change to project coverage 👍

Coverage data is based on head (aa6dadf) compared to base (9e3539b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #68   +/-   ##
=======================================
  Coverage   95.50%   95.50%           
=======================================
  Files          88       88           
  Lines        4604     4604           
=======================================
  Hits         4397     4397           
  Misses        207      207           

Impacted Files	Coverage Δ
rocketry/conditions/func.py	89.58% <100.00%> (ø)

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