Exception interfaces should extend Throwable

[tux-rampage]

When running Static-Analysis like Psalm, they will report an invalid catch statement:

InvalidCatch: Class/interface Psr\Container\NotFoundExceptionInterface cannot be caught

This happens because the Interfaces do not extend Throwable. This is correct since classes that do not implement Throwable cannot be used with throw: https://3v4l.org/NNDeW

[ChristophWurst]

See #33 for some context. This was fixed, then reverted again.

[Jean85]

Fixed again in 1.1.2 and 2.0.2