Suggest defer_iteration_parsing on stderr if opening a Series takes longer than a certain amount of time #1799
Description
Is your feature request related to a problem? If so, please describe.
People usually don't know about the config option {"defer_iteration_parsing": true} and then have to suffer through long opening times.
Describe the solution you'd like
Add a timeout in Iteration parsing. If the timeout is exceeded, suggest lazy parsing.
Would probably need a way to switch it back off again for users that want up-front parsing.
Describe alternatives you've considered
Make lazy parsing the default. It already is in READ_LINEAR, but it would break legacy code if applying it also to READ_RANDOM_ACCESS.
Additional context
No async or threading needed for implementation. Just check the time after each Iteration parsed.