Feat/api 4 reading alert configs

[howamith]

Related to #24

Implement endpoints for reading AlertConfigs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
api/src/application/routes/alert_config.rs	100.00% <100.00%> (ø)
...pi/src/application/services/fetch_alert_configs.rs	100.00% <100.00%> (ø)
api/src/application/services/mod.rs	100.00% <100.00%> (ø)
api/src/domain/models/alert_config.rs	100.00% <100.00%> (ø)
api/src/errors.rs	100.00% <100.00%> (ø)
api/src/infrastructure/middleware/response.rs	100.00% <100.00%> (ø)
api/src/lib.rs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes