refactor: rename aggregate::Saver method, move repositories into aggregate::repository mod

[ar3s3ru]

• refactor: rename aggregate::Saver::store in aggregate::Saver::save
• refactor: move aggregate::{Saver, Getter} to aggregate::repository::{Getter, Saver}
• feat: add .editorconfig
• chore: update CONTRIBUTING.md guidelines doc

[codecov]

Codecov Report

Patch coverage: 78.26% and project coverage change: -0.53 ⚠️

Comparison is base (2558e59) 87.75% compared to head (fb3e3bb) 87.23%.

❗ Current head fb3e3bb differs from pull request most recent head b01d126. Consider uploading reports for the commit b01d126 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
- Coverage   87.75%   87.23%   -0.53%     
==========================================
  Files          18       18              
  Lines        1160     1159       -1     
==========================================
- Hits         1018     1011       -7     
- Misses        142      148       +6     

Impacted Files	Coverage Δ
eventually/src/tracing.rs	0.00% <0.00%> (ø)
eventually-postgres/src/aggregate.rs	92.30% <75.00%> (ø)
eventually/src/aggregate.rs	90.35% <100.00%> (+0.45%)	⬆️
eventually/src/aggregate/repository.rs	88.88% <100.00%> (ø)
eventually/src/command.rs	87.25% <100.00%> (ø)
eventually-postgres/src/event.rs	92.81% <0.00%> (-3.87%)	⬇️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.