Add support for Hazelcast to do session caching

[nvchaudhari1991]

Would it be possible to add the support for Hazelcast to do session caching?

https://hazelcast.com/clients/cplusplus/

[zandbelt]

someone would have to write a C wrapper around the C++ client and link mod_auth_openidc against that; PRs are welcome, otherwise a commercial discussion via [email protected]