feat: add Projections support

[ar3s3ru]

Closes #93

This PR adds support for the Projection trait, and a Projector component to run and update a Projection in-memory.

[codecov]

Codecov Report

Merging #95 into master will increase coverage by 2.23%.
The diff coverage is 78.84%.

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage   51.95%   54.18%   +2.23%     
==========================================
  Files          13       14       +1     
  Lines         666      716      +50     
==========================================
+ Hits          346      388      +42     
- Misses        320      328       +8     

Flag	Coverage Δ
#unit	54.18% <78.84%> (+2.23%)	⬆️

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

Impacted Files	Coverage Δ
eventually-test/src/api.rs	12.72% <0.00%> (-0.36%)	⬇️
eventually-util/src/inmemory/store.rs	92.13% <ø> (ø)
eventually-test/src/order.rs	26.96% <57.14%> (+2.57%)	⬆️
eventually-util/src/inmemory/projector.rs	85.71% <85.71%> (ø)
eventually-test/src/lib.rs	97.22% <100.00%> (+1.38%)	⬆️
eventually-test/tests/acceptance_tests.rs	94.73% <100.00%> (ø)
eventually-core/src/store.rs	48.27% <0.00%> (+6.89%)	⬆️

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[sonarqubecloud]

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