Add an HTTP API for price calculation

Fixes #174 (closed)

Created by: codecov[bot]

Codecov Report

Merging #175 into master will increase coverage by 0.12%. The diff coverage is 98.39%.

@@            Coverage Diff             @@
##           master     #175      +/-   ##
==========================================
+ Coverage   96.85%   96.97%   +0.12%     
==========================================
  Files          46       48       +2     
  Lines        3653     3833     +180     
  Branches      474      492      +18     
==========================================
+ Hits         3538     3717     +179     
  Misses         77       77              
- Partials       38       39       +1     

Impacted Files	Coverage Δ
src/_zkapauthorizer/controller.py	94.42% <0.00%> (ø)
src/_zkapauthorizer/tests/test_client_resource.py	98.77% <96.07%> (-0.15%)
src/_zkapauthorizer/pricecalculator.py	100.00% <100.00%> (ø)
src/_zkapauthorizer/resource.py	98.73% <100.00%> (+0.50%)
src/_zkapauthorizer/storage_common.py	96.96% <100.00%> (+0.47%)
src/_zkapauthorizer/tests/strategies.py	96.15% <100.00%> (+0.17%)
src/_zkapauthorizer/tests/test_pricecalculator.py	100.00% <100.00%> (ø)
src/_zkapauthorizer/tests/test_strategies.py	100.00% <100.00%> (ø)
... and 1 more

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