Option to consume SDK via smaller JARs

[gshriver]

The current recommendation is that zowe REST API SDK be consumed by importing a single JAR.

While importing one single JAR file may be convenient for some consumers, importing one single JAR file has several disadvantages.

We would like to request that the zowe REST API SDK be able to be consumed in smaller chunks. Instead of a single JAR, we would like the ability to consume only those portions of the SDK which we intend to actively leverage at the present time.

[plavjanik]

This is related to #82