Create a module to save the test dependencies

[Igorxp5]

The results include:

• Hash of the content of each dependency file
• The test cases location, and the dependecy matrix. The depedency matrix will tell us what files each test cases covers.

Let's save those informations in a JSON file.

[Igorxp5]

See below the output of the plugin:

{
    "dependencies": {
        "test_dependencies.py::test_method_1": [
            "dependency.py"
        ],
        "test_dependencies.py::test_method_2": [
            "dependency.py",
            "dependency_2.py"
        ]
    },
    "file_hashes": {
        "dependency.py": "e9ea3569a1d9ffd7d638fa4feec37cc20d378100",
        "dependency_2.py": "eb239cdace7e3c5545f2e36c4f60d86163543f4f"
    }
}