chore(#2137): input - add in contextual example

[mxsoco]

This PR stems off of the issue: GovAlta/ui-components#2137

NOTE:

For the phone number example, I replicated the code snippets for the "dollar amount or costs" example including the angular code for the leading content.

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[mxsoco]

@ArakTaiRoth @Spark450 Input ready for review.

[ArakTaiRoth]

A couple of issues:

• For "Ask a user for bank details" Angular Event Based, you're missing the code for the change event.
• For "Ask a user for bank details" Angular Reactive Forms, you're missing the code for the FormControl's
• For "Ask a user for bank details" React, you're missing the onChange function referenced in all the input's

[mxsoco]

@ArakTaiRoth Adjusted the "...bank details" example. Let me know if there's anything else I should adjust.