Port `Version` from `hapi`.

[milkshakeuk]

Is your feature request related to a problem? Please describe.
Port the Version class/capability from hapi, this is used in various locations, currently we have worked around not having this but it would be worth having.

https://github.com/hapifhir/hapi-hl7v2/blob/330c2e72a34da9626e3f4f3de24a1bb2a8ef62bb/hapi-base/src/main/java/ca/uhn/hl7v2/Version.java#L36