feat request: add function getValueTrim()

[tonybranfort]

Add a function that will return the result of getValue() as a trimmed string.

Example

expect(myPo.lastName.getValue()).toBe('albeit '); 
expect(myPo.lastName.getValueTrim()).toBe('albeit'); 

Why

Because return myPo.lastName.getValue().then((val) => {expect(val.trim()).toBe('albeit');}); clutters tests, is slower to read, is needed often enough that it is annoying to constantly code.