Request: async support

[jamesbraza]

From https://github.com/microsoft/playwright-pytest/blob/v0.4.3/pytest_playwright/pytest_playwright.py#L23-L31, it's clear only synchronous usage is supported here (there are no async_api imports).

Thus, async workflows are not well supported by playwright-pytest. This request is to support asynchronous usage.

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Workaround

https://github.com/m9810223/playwright-async-pytest exists, but it's currently pinned to an older version of pytest-playwright: https://github.com/m9810223/playwright-async-pytest/blob/v0.3.0/pyproject.toml#L4

[jamesbraza]

Actually, this is a duplicate of #74

[mxschmitt]

Note: I was working on it a while ago but struggled implementing the requirements we had: #184 (comment)

[jamesbraza]

I added some PR comments, feel free to bounce ideas off me if that helps

[m9810223]

I just loosen the version of pytest-playwright in https://github.com/m9810223/playwright-async-pytest.