revisit relation between marks and keywords

[RonnyPfannschmidt]

followup to #4564

classically marks where turned into keywords, by simply dumping the __dict__ of a function into a nodes keyword, implying the now removed MarkInfo objects landing in the keyword mapping

to ensure keywords keep working as they used to, i decided to add all mark names that where not already known keywords to the keywords of a node

but thats a pretty horrible hack and should be sorted out in a more principled manner

[rajibmitra]

Is anyone working on this issue ? If not , I would like to work on this .

[RonnyPfannschmidt]

@rajibmitra currently nobody is working on this one, but i also believe this one is one of the harder ones because its one of those things where a simple cleanup may break downstream users in subtle manners thats not expressed by our own testsuite

[rajibmitra]

so can you please point me to any simple issues @RonnyPfannschmidt

[RonnyPfannschmidt]

@rajibmitra we have https://github.com/pytest-dev/pytest/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+easy%22 set up to get started