When the symbol `__all__` is defined in a module, `mp_import_all()` should
import all listed symbols into the global environment, rather than relying
on the underscore-is-private default. This is the standard in CPython.
Each item is loaded in the same way as if it would be an explicit import
statement, and will invoke the module's `__getattr__` function if needed.
This provides a straightforward solution for fixing star import of modules
using a dynamic loader, such as `extmod/asyncio` (see issue #7266).
This improvement has been enabled at BASIC_FEATURES level, to avoid
impacting devices with limited ressources, for which star import is of
little use anyway.
Additionally, detailled reporting of errors during `__all__` import has
been implemented to match CPython, but this is only enabled when
ERROR_REPORTING is set to MICROPY_ERROR_REPORTING_DETAILED.
Signed-off-by: Yoctopuce dev <dev@yoctopuce.com>
