Support classifier attribute for dependency.

[asafambar]

• All tests passed. If this feature is not already covered by the tests, I added new
  tests.

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[asafambar]

Support classifier attribute from pom.xml.
If exists its added it to dependency object and concat to its version, its part of the uniqueness of each dependency
In a Maven pom.xml file, the classifier attribute is used to specify an additional qualifier for a dependency. It allows you to differentiate between different variations or flavors of the same artifact. For example, if you have multiple versions or types of a library (e.g., a library that supports different platforms or configurations), you can use the classifier attribute to specify which one you want to include as a dependency. This helps in resolving conflicts and ensuring the correct version of the dependency is included in your project.

[attiasas]

LGTM