MatSlider - MatNumeric Maximum, Minimum and Step.

[enkodellc]

Referring to how the other components do it but MatSlider is ValueMax / ValueMin / Step & MatNumeric is Maximum, Minimum and Step.

I would like to see it consistent across the components or since we only have 2 instances of "Max/Min/Step" that I found we can refer to material.io for the tie breaker?

Material-UI uses step, min, max for their Slider - Which I think is best and suggest refactoring the Slider and MatNumeric for this. Not in this PR.

Refer to #725

[sramaswami11]

@enkodellc I can work on this, Could you please assign this to me?

[sramaswami11]

@enkodellc , Created the following PR with the required code changes:
#877