Cache in KeyStoreCredentialStore must work with lowercase aliases (keys) too.

When I work directly with CredentialStore API I see there problem with case sensitive aliases. I located problem to used cache.
There is one place when we store new entry and where is not key in lowercase.
e.g.
https://github.com/wildfly-security/wildfly-elytron/blob/master/src/main/java/org/wildfly/security/credential/store/impl/KeyStoreCredentialStore.java#L326