Enhance datasets APIs to accept all parameters of z/OSMF

[jordanCain]

Describe the solution you'd like
z/OSMF has extra parameters when creating a dataset,

Model for allocating datasets doesn't support storage class and other properties
https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.4.0/com.ibm.zos.v2r4.izua700/IZUHPINFO_API_CreateDataSet.htm#CreateDataSet__Reqbod

Describe alternatives you've considered
Using z/OSMF APIs directly

Additional context
Originally raised here zowe/api-layer#900

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Engineering team info (eg https://github.com/zowe/explorer-jes/issues/4)

As a [type of user],
I want [some goal]
so that [some reason].

Details/notes
[Detail - implementation notes]

Acceptance Criteria

*Scenario 1: [Title]
Given [context]
And [some more context]...
When [event]
Then [outcome]
 And [another outcome]...

[jordanCain]

@Destabilizator Can you inform on the priority of this? Could you tell us what it's blocking you from being able to do?

[Destabilizator]

I have to go directly to z/OSMF API instead of going through API ML, because I need to allocate datasets via STORCLAS.
My whole app runs behind API ML, so it's a bit weird to sometimes have to go around it :-/