Add some recovery-related endpoints

This is related to #235. It implements GET and POST for the recover endpoint - though only wrapped around the thinnest feasible underlying implementation (in particular, not one which can recover anything - but hopefully which has the same shape as one which can).

Created by: codecov[bot]

Codecov Report

Merging #303 (b27dd5e2) into main (384d8cbd) will increase coverage by 0.07%. The diff coverage is 92.33%.

@@            Coverage Diff             @@
##             main     #303      +/-   ##
==========================================
+ Coverage   91.40%   91.47%   +0.07%     
==========================================
  Files          51       53       +2     
  Lines        4595     4893     +298     
  Branches      631      675      +44     
==========================================
+ Hits         4200     4476     +276     
- Misses        345      366      +21     
- Partials       50       51       +1     

Impacted Files	Coverage Δ
src/_zkapauthorizer/_plugin.py	71.54% <66.66%> (-0.13%)
src/_zkapauthorizer/tests/sql.py	72.54% <72.54%> (ø)
src/_zkapauthorizer/tests/strategies.py	93.25% <88.09%> (-0.97%)
src/_zkapauthorizer/recover.py	95.34% <95.34%> (ø)
src/_zkapauthorizer/tests/test_model.py	93.40% <97.29%> (+0.60%)
src/_zkapauthorizer/model.py	94.39% <100.00%> (+0.14%)
src/_zkapauthorizer/resource.py	99.00% <100.00%> (+0.33%)
src/_zkapauthorizer/tests/test_client_resource.py	97.87% <100.00%> (+0.75%)

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