Update the regex for the PowerShell parser:

1. Support matching the PowerShell cmdlets and parameters;
2. For operators, update the regex to match pipeline operator | and the array literal operator ,;
3. For attributes, update the regex to match more available attributes;
4. Make attribute and keyword matching case insensitive;
5. Add pwsh as an alias for the PowerShell language;
6. Add the color setting for PowerShell command and parameter for both the default dark and light themes.