chore: add commented out new properties that can be used for debugging

See:
- https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.1-Release-Notes#logging-groups
- https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.1-Release-Notes#logging-refinements

Should be in e9eb623 commit.

Relate to #1161

[skip ci]

Author: php-coder

src/main/resources/application.properties

@@ -3,8 +3,12 @@ spring.profiles.active: test
 server.address: 127.0.0.1
 server.port: 8080
 
+# Properties that are useful for debugging (with its default values)
 debug: false
 trace: false
+logging.level.sql: INFO
+logging.level.web: INFO
+spring.http.log-request-details: false
 
 spring.main.banner-mode: off