Debugger: hide pydev frozen module warnings; remove patching on Python 3.12+

Closes #695 (closed)

The origin is this line:

import pydevd

Here's the explanation

The solution depends on the Python version:

1. for Python <= 3.11 we set at run-time os var "PYDEVD_DISABLE_FILE_VALIDATION" to True (if it is not set by user) and then import pydevd
2. for Python >= 3.12 we not do anything (no patching), due to it works out of the box anyway using the new sys.monitoring hooks. But user still can force pydevd patching by set os variable "PYTANGO_FORCE_DEBUG_TRACE_PATCHING" to True. Is that case it works as for old Pythons, with "PYDEVD_DISABLE_FILE_VALIDATION"

And in any case, now we give coverage preferences (since, actually, debugging does not really work with coverage anyway)