Add support for error and exception filtering

[rubenvanassche]

• Filter PHP errors by their level, for example: E_ALL & ~E_NOTICE
• FIlter exceptions via a callable

Can also be used within a Laravel install!

For errors:

Flare::reportErrorLevels(E_ALL & ~E_USER_NOTICE);

For exceptions:

Flare::filterExceptionsUsing(fn(Throwable $throwable) => false);

By default, these filters are disabled.