[HYDRAR-145][HYDRAR-167][HYDRAR-180] Return r4ml.frame object for r4ml.read.csv method, Remove TODO for auto convert of non numeric r4ml.frame and changing step.lm intercept order

[tsgshankar]

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[R4ML-CI]

Build triggered.

[R4ML-CI]

Unit test failed.

[bdwyer2]

Should we give the user a way to not have the data automatically repartitioned when read in through r4ml.read.csv()?

[R4ML-CI]

Build triggered.

[R4ML-CI]

Build success. All unit tests passed.