[feature] self-documented carrier option definition

[danh91]

• designing carrier option definition abstraction
• update carrier options definitions to pass the tests
• update docs with options description and types

[codecov]

Codecov Report

Merging #97 (45c0d6b) into main (6b75176) will decrease coverage by 0.02%.
The diff coverage is 98.75%.

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
- Coverage   96.20%   96.18%   -0.03%     
==========================================
  Files         131      131              
  Lines        5114     5136      +22     
  Branches      264      257       -7     
==========================================
+ Hits         4920     4940      +20     
- Misses        136      137       +1     
- Partials       58       59       +1     

Impacted Files	Coverage Δ
...urplship/providers/canadapost/shipment/contract.py	96.77% <0.00%> (+1.90%)	⬆️
...ship/providers/canadapost/shipment/non_contract.py	65.51% <0.00%> (-4.76%)	⬇️
purplship/purplship/core/units.py	94.19% <89.65%> (+0.03%)	⬆️
purplship/purplship/core/utils/enum.py	92.68% <96.55%> (+9.34%)	⬆️
.../canadapost/purplship/providers/canadapost/rate.py	85.29% <100.00%> (-8.83%)	⬇️
...canadapost/purplship/providers/canadapost/units.py	100.00% <100.00%> (ø)
...tensions/canpar/purplship/providers/canpar/rate.py	100.00% <100.00%> (ø)
...npar/purplship/providers/canpar/shipment/create.py	100.00% <100.00%> (ø)
...ensions/canpar/purplship/providers/canpar/units.py	100.00% <100.00%> (ø)
...hl_express/purplship/providers/dhl_express/rate.py	78.57% <100.00%> (ø)
... and 11 more

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