Common java helpers.

This submodule is inherited by all other java modules in the monorepo! It is therefore important that we do not add dependencies to it, as those dependencies will also be added to every java module. The only dependencies that this module uses are the ones declared in the build.gradle at the root of the Airbyte monorepo. In other words it only uses dependencies that are already shared across all modules. The dependencies section of the build.gradle of airbyte-commons should always be empty.

For other common java code that needs to be shared across modules that requires additional dependencies, we follow this convention: airbyte-commons-<name of lib>. See for example airbyte-commons-cli.