Ecosystem workflows configuration

In order to talk control of execution workflow of tests in ecosystem
repository should have qe_config.json file (we can rename it in future) in a root directory.

Structure of config file:

• dependencies_files: list[string] - files with package dependencies to install (ex: requirements.txt, packages.json)
• extra_dependencies: list[string] - names of additional packages to install before tests execution
• language: string - programming language for tests env. Only supported lang is Python at this moment.
• tests_command: list[string] - list of commands to execute tests

Example:

{
    "dependencies_files": [
        "requirements.txt",
        "requirements-dev.txt"
    ],
    "extra_dependencies": [
        "pytest"
    ],
    "language": "python",
    "tests_command": [
        "pytest -p no:warnings --pyargs test"
    ]
}

Maybe add python version? it could also be in the language section: "language": "python3.8"