Add Gradle Lock files

[idelpivnitskiy]

Motivation:

Lock files will help us see what dependencies are used by every module. When we bump any dependency, it will also show what transitive dependencies are upgraded automatically.
See: https://docs.gradle.org/current/userguide/dependency_locking.html

Modifications:

• Update main build.gradle to activate dependency locking;
• Add check-lockfiles.sh script for PRQ validation;
• Add ci-prq.yml step to run check-lockfiles.sh;
• Generate initial lockfiles;

Result:

We will be able to observe how dependency updates change all transitive dependencies.