WELD-1756 Replace Guava - caches

- we are not able to replace the ClassTransformer.enhancedAnnotatedTypes due to recursion computation problems
- LoadingCacheUtils should be deleted afterwards
WELD-1756 Don't catch guava ExecutionError, code cleanup, javadoc update
WELD-1756 Revert one replacement in SpecializationAndEnablementRegistry

- recursion computation problems
WELD-1756 Update ComputingCache javadoc - recursive computations are not
supported