Warn when partial enumeration values are used

Here's a little known feature that could come back to bite someone later with a broken script:

gsv blah -ea ig

I'm not sure in which version of PowerShell this was added, but you can now use partial enumeration values and as long as that partial value leads to an unambiguous match, it will be accepted.

This may result in errors in scripts that appear to be working correctly if a new emumeration value is added with the same leading characters as those that are in use within a script. It's the same issue/risk with using partial parameter names in scripts. Shorthand should be for ad-hoc use only, and PSScriptAnalyzer should have a rule that warns whenever an enumeration value is used in a script in shorthand (such as in the command above).

使用範例 gsv blah -ea ig 作為要調查的行為，並找出現有的 PSScriptAnalyzer 規則以及針對可比較警告的測試結構。當使用無歧義部分列舉值的指令碼產生警告，而完整值仍被接受時，即視為完成。