feat: rearange file structure

src/main/kotlin/configuration/DynamoDbMigration.kt

src/main/kotlin/configuration/InjectionConfiguration.kt

src/main/kotlin/configuration/RoutingConfiguration.kt

src/main/kotlin/player/dtos/PlayerCreationDTO.kt

src/main/kotlin/player/dtos/PlayerInfoDTO.kt

src/main/kotlin/player/dtos/PlayerUpdateDTO.kt

src/main/kotlin/player/entities/Player.kt

src/main/kotlin/player/repositories/PlayerRepository.kt

src/main/kotlin/player/routes/PlayerRoute.kt

src/main/kotlin/player/services/PlayerService.kt

src/main/kotlin/player/services/PlayerServiceImpl.kt

src/test/kotlin/player/PlayerIntegrationTest.kt

src/test/kotlin/player/PlayerServiceTest.kt