feat: implement new cli command to read tests

[DudaGod]

What is done

Implement ability to read tests using cli command npx testplane list-tests which support options like for run tests:

• --config;
• --browser;
• --set;
• --require;
• --grep; and new options:
• --ignore;
• --silent;
• --output-file;
• --formatter.

The formatter supports 2 values: list (default) and tree. When using list user get plain list of unique tests, example:

[
    {
        "id": "5a105e8",
        "titlePath": [
            "test1"
        ],
        "browserIds": [
            "yandex",
            "chrome"
        ],
        "file": "tests/second.hermione.js",
        "pending": false,
        "skipReason": ""
    },
    {
        "id": "d2b3179",
        "titlePath": [
            "suite",
            "test2"
        ],
        "browserIds": [
            "yandex",
            "chrome"
        ],
        "file": "tests/second.hermione.js",
        "pending": false,
        "skipReason": ""
    }
]

The same data in tree formatter looks like:

[
    {
        "id": "36749990",
        "title": "suite",
        "line": 3,
        "column": 1,
        "file": "example.hermione.js",
        "suites": [],
        "tests": [
            {
                "id": "d2b3179",
                "title": "test2",
                "line": 4,
                "column": 5,
                "browserIds": [
                    "yandex"
                ],
                "pending": false,
                "skipReason": ""
            }
        ],
        "pending": false,
        "skipReason": ""
    },
    {
        "id": "5a105e8",
        "title": "test1",
        "line": 1,
        "column": 1,
        "browserIds": [
            "yandex"
        ],
        "file": "example.hermione.js",
        "pending": false,
        "skipReason": ""
    }
]

the important difference is that the tree formatter supports line and column fields. They can be used to find out exactly where the suite or test is declared in the file. It will be used in vscode extension.

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The same output is supported via API - testCollection.format(<type>)