[Android] Adding support for RatingInput and readOnly Rating Element

[singhmanp0707]

Support for New Rating elements

This PR adds support for two new elements: "Input.Rating" and "Rating". First one is for taking rating value as input from users and second one shows rating value in read only mode.

Spec for Input.Rating:

Property name	Required	Type	Allowed values	Description
type	Yes	String, must be Input.Rating
id	Yes	String
requires		Object
isVisible		Boolean
separator		Boolean
height		String	Auto, Stretch
horizontalAlignment		String	Left, Center, Right
spacing		String	None, Small, Default, Medium, Large, ExtraLarge
targetWidth		String	VeryNarrow, Narrow, Standard, Wide
label		String
isRequired		Boolean
errorMessage		String
valueChangedAction		Action object, can only be an Action.ResetInputs
value		Number		The number of stars selected by default. Cannot exceed max if max is specified.
		SMBA: just ensure it’s a number
max		Number		The total number of stars. Maximum and default is 5.
		SMBA: just ensure it’s a number
allowHalfSteps		Boolean		Determines if the user can select half stars
size		String	Medium or Large	The size of the stars
color		String	Neutral or Marigold	The color of the stars

Spec for Read Only Rating:

Property name	Required	Type	Allowed values	Description
type	Yes	String, must be Rating
id		String
requires		Object
isVisible		Boolean
separator		Boolean
height		String	Auto, Stretch
horizontalAlignment		String	Left, Center, Right
spacing		String	None, Small, Default, Medium, Large, ExtraLarge
targetWidth		String	VeryNarrow, Narrow, Standard, Wide
value		Number		The number of stars selected. Cannot exceed max if max is specified.
count		Number		The number of ratings that make up the average (see the gold star in the example above)
max		Number		The total number of stars. Maximum and default is 5.
size		String	Medium or Large	The size of the stars
color		String	Neutral or Marigold	The color of the stars
style		String	Default or Compact	In compact mode, only one star is displayed.

Sample Card