It turns out that the memory costs of the internal caches of `MetadataProvider` and `ReflectionManager` can be significant.

Ideally I'd recommend to fully discard a `ReflectionManager` after its use, but in some cases this isnot practical, so exposing a "reset" method is useful.

One needs to consider that when using such a reset, the `ReflectionManager` instance retains its configuration but.