[OSJC-101] Add support for setting and retrieving additional gear storag...

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@adietish In regards to where this interface method should reside, if you believe it should move to a separate interface I could  be convinced to change it.  Maybe this is an opportunity to define a capability for cartridges.  Could it be a 'deployed cartridge'? Is there any significance to identifying it as 'embedded' or 'standalone'?  I also havent looked, but does that also require us to cast when we use it?