SDK: Change API's return type to custom object

[anencore94]

/kind feature

Describe the solution you'd like
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For now, Many APIs in katib_client.py don't treat type strictly, just using dict.

We could change those to deserialize well, and finally use katib's custom objects(classes).

There was a discussion for this issue.

• SDK: change list apis to return objects as default #1630 (comment)

Anything else you would like to add:
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[midhun1998]

Hi @anencore94 . If this is still open I can pick this up.

[anencore94]

Yes please. I couldn't afford this now. Thank you :) @midhun1998

[midhun1998]

/assign

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