## PR Checklist
* [x] Closes https://github.com/microsoft/terminal/issues/9941
* [x] CLA signed.
## Detailed Description of the Pull Request / Additional comments
The bug is due to us using std::tolower, while the default locale is not user's locale.
The fix here is to use the same approach as upon sorting: lstrcmpi.
While there are additional methods to do locale aware comparison,
here we convert chars to string and call lstrcmpi.
While this approach seems somewhat inefficient it ensures consistency
(with the order of locales that lstrcmi tries to apply internally).
First step towards #8415:
* Introduce `PaletteItem` and derive from it to provide native support
for tabs and command lines (`ActionPaletteItem` / `TabPaletteItem`,
`CommandLinePaltteItem`)
* Remove business logic behind PaletteItem from palette (aka dispatch
commands and preview tabs externally)
* Created a ViewModel class in the Command Palette called
FilteredCommand, aggregating the Command, the filter and the
highlighted presentation of the command name
* This ListView of the filtered commands is bound to the vector of
FilteredCommands
* Introduced HighlightedTextControl user control with HighlightedText
view model
* Added this control to the ListView Item's grid
* Bound the FilteredCommand's highlighted command name to the user
control
## Validation Steps Performed
* UT for matching algorithm
* Only manual tests
* Searching in CommandLine, SwitchTab and Nested Command modes
* Checking for bot matching an non matching filters
* Dogfooding
Closes#6646
