feat: move versioning check on the EventStore

[ar3s3ru]

Closes #62

NOTE: this PR breaks eventually-postgres, which should go on a full overhaul.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #79 into master will increase coverage by 2.14%.
The diff coverage is 47.56%.

@@            Coverage Diff             @@
##           master      #79      +/-   ##
==========================================
+ Coverage   17.66%   19.81%   +2.14%     
==========================================
  Files          12       12              
  Lines         402      424      +22     
==========================================
+ Hits           71       84      +13     
- Misses        331      340       +9     

Impacted Files	Coverage Δ
eventually-core/src/repository.rs	0.00% <0.00%> (ø)
eventually-postgres/src/lib.rs	0.00% <0.00%> (ø)
eventually-test/src/api.rs	0.00% <0.00%> (ø)
eventually-test/src/main.rs	0.00% <0.00%> (ø)
eventually-core/src/store.rs	22.72% <21.42%> (-37.28%)	⬇️
eventually-util/src/inmemory.rs	79.79% <78.26%> (-5.14%)	⬇️

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