Separate score for round and score for passes into two functions

[jatkinson1000]

Closes #4

Add score_for_passes function that can be called by score_for_round such that the latter now returns a single number which is more intuitive.

This is a Breaking Change implemented in preparation for first release.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (68043ff) 95.06% compared to head (6916eb1) 95.07%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #51   +/-   ##
=======================================
  Coverage   95.06%   95.07%           
=======================================
  Files          22       22           
  Lines        1216     1218    +2     
=======================================
+ Hits         1156     1158    +2     
  Misses         60       60           

Files	Coverage Δ
...tils/classifications/agb_indoor_classifications.py	98.43% <ø> (ø)
.../classifications/agb_old_indoor_classifications.py	97.91% <ø> (ø)
...ils/classifications/agb_outdoor_classifications.py	99.15% <ø> (ø)
archeryutils/handicaps/handicap_equations.py	100.00% <100.00%> (ø)
archeryutils/handicaps/tests/test_handicaps.py	100.00% <ø> (ø)
archeryutils/handicaps/handicap_functions.py	82.74% <83.33%> (ø)

[jatkinson1000]

Codecov diff is complaining about a line that wasn't hit in previous testing, so OK to merge.