feat: add authorization metrics

[wschurman]

Why

In Expo's application, we'd like to have metrics/graphs for this to indicate whether a new deployment causes a huge spike in authentication errors. To do this accurately, the best way is to hook into the entity framework's metrics adapter.

How

Add metrics adapter method and call it in privacy policy evaluation.

Test Plan

Run all tests.

[codecov]

Codecov Report

Merging #142 (afff869) into master (1405a91) will increase coverage by 0.05%.
The diff coverage is 100.00%.

❗ Current head afff869 differs from pull request most recent head ffead0d. Consider uploading reports for the commit ffead0d to get more accurate results

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
+ Coverage   95.83%   95.89%   +0.05%     
==========================================
  Files          73       73              
  Lines        1825     1851      +26     
  Branches      226      228       +2     
==========================================
+ Hits         1749     1775      +26     
  Misses         75       75              
  Partials        1        1              

Flag	Coverage Δ
integration	95.89% <100.00%> (+0.05%)	⬆️
unittest	95.89% <100.00%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/entity/src/EntityMutator.ts	98.20% <ø> (ø)
packages/entity/src/Entity.ts	100.00% <100.00%> (ø)
packages/entity/src/EntityCompanion.ts	100.00% <100.00%> (ø)
packages/entity/src/EntityCompanionProvider.ts	100.00% <100.00%> (ø)
packages/entity/src/EntityLoader.ts	89.24% <100.00%> (+0.11%)	⬆️
packages/entity/src/EntityLoaderFactory.ts	100.00% <100.00%> (ø)
packages/entity/src/EntityPrivacyPolicy.ts	97.26% <100.00%> (+0.65%)	⬆️
packages/entity/src/ViewerScopedEntityCompanion.ts	100.00% <100.00%> (ø)
...ckages/entity/src/metrics/IEntityMetricsAdapter.ts	100.00% <100.00%> (ø)
...ges/entity/src/metrics/NoOpEntityMetricsAdapter.ts	100.00% <100.00%> (ø)

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