Update BclLauncher.cs to use ArgumentList property

[tompnub]

Attempting to open files and folders on MacOs with spaces or special characters in the path using Launcher.LaunchFileAsync fails due to incorrect parsing of the arguments property of ProcessStartInfo.
Using the ArgumentList property avoids having to escape spaces and special characters, which would otherwise cause the open command to fail and either split the argument string or not find the required files and folders with special characters.

What does the pull request do?

Fixes a bug that prevents Launcher.LaunchFileAsync from opening files and folders with spaces or special characters in the path name on MacOS.

What is the current behavior?

When attempting to open a path with spaces, the method returns true, but no file or folder is opened since the file path is treated as multiple arguments to the open command, "The files part1, part2, etc. do not exist" is printed to the debug console since the split arguments will usually not represent valid paths. Similarly paths with quotes or other special characters (valid in macos paths) can return "The file XYZ does not exist".

What is the updated/expected behavior with this PR?

Correctly opening files and folders with spaces or special characters their path.
To test run:

Launcher.LaunchFileAsync(StorageProvider.TryGetFolderFromPathAsync(pathWithSpacesOrQuotes)); 
Launcher.LaunchDirectoryInfoAsync(new DirectoryInfo(pathWithSpacesOrQuotes));

Tested and functions correctly on macos with path:
/Users/username/Documents/_TEST/appname/TestProjects/AvaloniaLauncherBugTest/AvaloniaLauncherBugTest/Test folder |&;()<>~*@?!$#[]{}'
Also tested on Windows 11 and works correctly.

How was the solution implemented (if it's not obvious)?

In static method BclLauncher.Exec, instead of passing urlOrFile to the Argument property, on MacOS it is passed via ArgumentList.Add (no argument is passed on Windows).

Checklist

• Added unit tests (if possible)? - unclear how to set up a unit test since no exception is thrown and the function returns true.

Fixed issues

Fixes #19702 as well as any issues with special characters on macOS.

[tompnub]

ArgumentList is not available in all .net versions it seems some manual parsing will have to be used instead.

[cla-avalonia]

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[robloo]

Note that there is a plan to remove .NET Framework and .NET Standard 2.0 support for Avalonia 12. When that is done ArgumentList can be used without issue.

[tompnub]

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[tompnub]

I have tried various solutions to escaping the file and directory paths using ProcessStartInfo.Argument on macos, but been unable to figure out a comprehensive method that works with all valid macos path names:
Paths with spaces

• double quoting the argument solves this and most issues
  $"\"{path}\""

Paths with spaces and quotes:

• single escaping the quote does not work file not found
• triple escaping the quote does not work .Replace("\"", "\\\\\\\""); // file not found

Paths with backslash:
- // file not found.

I'll give it another try when I get back to my dev mac next week.