This commit applies the `java-test-fixtures` to the project modules and
starts moving common infrastructure to the testFixtures configuration.
See gh-217
This commit applies the Compiler Conventions Gradle plugin to the
project modules and fix the issues raised by the compiler linter.
This commit also moves version management to the main build file for a
few dependencies, aligning the versions in the process.
This commit refactors the project build to better share dependency
management definitions between modules.
This also upgrades the project to Spring Boot 2.5.0.
Closes gh-45
