provide framework integration for warning filter setup

pytest overriding previously existing warnings setups creates troube when using warnings filters as a signaling mechanism

in a project i had a warnigns.simplefilter("error", FWExpiredDeprecationWarning)
which was ignored under pytest

as a crude workaround i created

import warnings
from fw.deprecations import install_filter

from pytest import hookimpl


@hookimpl(tryfirst=True)
def pytest_runtest_protocol():
	install_filter()


pytest_collection = pytest_runtest_protocol

to trigger the warnings at least in some cases

it would e nice if pytest provided a general hook to setup own filters in the warning filter setup

pytest_setup_warningfilter(...) might be a nice addition

Start by locating pytest's warning-filter setup and reviewing the issue's workaround, including install_filter and the proposed pytest_setup_warningfilter hook. Determine how an integration point could preserve project-defined filters during pytest runs. Done means the requested general hook is defined and documented with coverage for existing warning-filter behavior.