Make extras available within the plugin

[Stefanhg]

Hello,

I think it would be a good idea to make the "extras" list available in the plugin and the needed pytest_runtest_makereport hook also. This would make it much easier to work with instead of having to add additional code in your project in order to support extras.
Example:

import pytest
EXTRAS = []

@pytest.hookimpl(hookwrapper=True)
def pytest_runtest_makereport(item, call):
    outcome = yield
    report = outcome.get_result()
    if report.when == 'call':
        report.extra = EXTRAS

Instead could be replaced with both a fixture for adding extras and the actual list just like pytest_html has support for.

examples:

def test_extras(extra):
     extra.append(
     {
        "name": "Text",
        "format": "text",
        "content": "<lorem ipsum> " * 100,
    })

from pytest_reporter import extras

def test_extras():
     extra.append(
     {
        "name": "Text",
        "format": "text",
        "content": "<lorem ipsum> " * 100,
    })

[christiansandberg]

I actually misspelled extras without an s. It was meant for compatibility with pytest-html so with next release you can use the pytest-html plugin to do that. Although it would be nice to be able to add extras without installing an additional plugin.