Update PSUseCorrectCasing to enforce correct casing of language keywords

Summary of the new feature

Incorrect case of language keywords should result in a PSUseCorrectCasing rule violation.

A list of keywords can be obtained by reflection:

[ref].Assembly.GetType('System.Management.Automation.Language.Tokenizer').
GetDeclaredField('_keywordText').
ForEach{ $PSItem.GetValue($null) }

elseif
if
else
switch
foreach
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in
for
while
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try
catch
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trap
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return
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throw
begin
process
end
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function
filter
param
class
define
var
using
workflow
parallel
sequence
inlinescript
configuration
public
private
static
interface
enum
namespace
module
type
assembly
command
hidden
base

What is the latest version of PSScriptAnalyzer at the point of writing
1.19.0

从 PSUseCorrectCasing 规则和通过 Tokenizer 反射获取的 PowerShell 关键字列表开始。检查该规则当前如何检测大小写违规，然后覆盖列出的关键字，并验证大小写不正确的语言关键字会被报告，而大小写正确的关键字会被接受。