Dyn cache API guidelines audit

[anp]

Closes #178

[codecov]

Codecov Report

Merging #180 into main will decrease coverage by 0.07%.
The diff coverage is 45.23%.

@@            Coverage Diff             @@
##             main     #180      +/-   ##
==========================================
- Coverage   28.16%   28.09%   -0.08%     
==========================================
  Files          47       47              
  Lines       11290    11292       +2     
  Branches     6036     6038       +2     
==========================================
- Hits         3180     3172       -8     
- Misses       6028     6038      +10     
  Partials     2082     2082              

Impacted Files	Coverage Δ
dyn-cache/src/cache_cell.rs	76.19% <ø> (ø)
dyn-cache/src/dep_node.rs	66.21% <0.00%> (-2.54%)	⬇️
topo/src/slot.rs	67.39% <0.00%> (ø)
dyn-cache/src/namespace.rs	25.27% <47.05%> (-2.10%)	⬇️
dyn-cache/src/definition.rs	45.05% <50.00%> (-1.24%)	⬇️
dyn-cache/src/lib.rs	80.00% <66.66%> (+7.27%)	⬆️

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