Create a caching SMP client class

[phax]

Same as SMPClient but with a time-based cache, that keeps the previous results for like 24 hours.
Key: participant ID, document type ID, process ID and transport protocol.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[phax]

Using the new interfaces ISMPServiceMetadataProvider, ISMPServiceGroupProvider, IBDXRServiceGroupProvider, IBDXRServiceMetadataProvider, IBDXR2ServiceGroupProvider and IBDXR2ServiceMetadataProvider of the v7.0.6 release, this can now be achieved more easily