Sample XPath utility for Coded UI Test

Introduced a sample utility that adds XPath query support to Coded UI Test for searching controls. This utility provides two extension methods, `FindFirstByXPath` and `FindAllByXPath`, to the `UITestControl` class. It leverages the built-in XPath parser and .NET classes, conforming to .NET's XPath Syntax. The post highlights two key limitations: a semantic difference in search (depth-first vs. breadth-first) and a performance penalty compared to the built-in search. It advises prudent use of this utility, recommending it for scenarios where the ease of use and power of XPath are critical and the control tree is not excessively deep.