feat: add direnv for local dev

[ar3s3ru]

• feat: add direnv config for local dev
• chore: run cargo fmt with new rustfmt config

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files	Coverage Δ
eventually-postgres/src/aggregate.rs	92.37% <ø> (+0.06%)	⬆️
eventually-postgres/src/event.rs	96.15% <ø> (+0.02%)	⬆️
eventually/src/aggregate.rs	90.45% <ø> (+0.09%)	⬆️
eventually/src/aggregate/repository.rs	88.88% <ø> (ø)
eventually/src/command.rs	87.25% <ø> (ø)
eventually/src/command/test.rs	98.41% <ø> (ø)
eventually/src/event.rs	33.33% <ø> (ø)
eventually/src/event/store.rs	96.44% <ø> (ø)
eventually/src/serde/prost.rs	0.00% <ø> (ø)
eventually/src/tracing.rs	0.00% <ø> (ø)

... and 3 files with indirect coverage changes

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