Allow for combining file rotation triggers by accepting a list of rotation conditions

[CollinHeist]

Background

I found myself (and others) wanting to rotate log files based on a combination of two already-implemented conditions (file size and interval in my case). I see there is existing functionality to allow arbitrary logic in the rotation by passing in a generic callable, however that would have required me to re-implement much of loguru's existing rotator functionality (or import code from within the loguru source).

A cleaner approach would be to permit the specification of lists (or generic iterables) in the rotation argument, and then have loguru parse each element into a combined rotation rotation logic where a file will be rotated if any of the rotators evaluate to true.

Example

from loguru import logger

logger.configure(
  handlers=[
    dict(
      sink='file.log',
      rotation=['12h', '10 MB'],
    )
  ]
)

Would rotate log files every 12 hours or every 10 Megabytes. This is much easier for the end-user than creating a custom callable of the same logic.

I've submitted this PR

[Delgan]

Fixed by #1175.