Allow to configure pytest-pystack outside the pytests configuration section

[Czaki]

Is your feature request related to a problem? Please describe.

Option to set parameters to pystack in ini file (tool.pytest.ini_options section in pyproject.toml) is really nice. But pytest-pystack currently could be installed only on linux. So if a project is designed to work on multiple operating systems, then configuring pytest-pystack this way collides with --strict-config

It will be nice to be able to use strict config and configure pytest-pystack in file at the same time.

Describe the solution you'd like
A clear and concise description of what you want to happen.

Add option to configure pytest-pystack using own section in pyproject.toml

Describe alternatives you've considered

Play with conditional test configuration in tox/nox file.