Commits on Oct 8, 2022

1. Fix TypeAs.UNWRAP_MAP_VALUE_OF and TypeAs.UNWRAP_MAP_KEY_OF return wr… …

   …ong results for multimaps (& other more complicated generic references)
   
   Fixes sundrio#341
   
   This PR adds a new reusable routine `TypeCast`, which is used to investigate type relations with respect to generic arguments (like improved `isInstanceOf`).
   
   `TypeCast` is then used by three new utility methods to `Collections`: `getCollectionElementType`, `getMapKeyType` and `getMapValueType`.
   These are similar to `TypeAs.UNWRAP_MAP_VALUE_OF` & friends, but return `Optional.empty()` when the supplied type is not a Collection / Map (as opposed to the supplied type itself).
   In fact, the `UNWRAP_*` functions now delegate to `Collections` and therefore now return more accurate results.
   
   Last but not least, I have identified a new public routine `TypeArguments.getGenericArgumentsMappings(ClassRef ref, TypeDef definition)`.
   This creates a mapping from generic types on a TypeDef to their instantiation on ClassRef. This code has been used at multiple places both in sundrio, but also in kubernetes-client. So I think it deserves a common implementation.

   

   xRodney authored and iocanel committed Oct 8, 2022
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