Enhance whitespace issue logging with a detailed TextChange message

[JoeRobich]

Since we are unable to report which rules were broken when applying the Roslyn formatter, this PR converts each TextChange into a detailed message reporting what type of change was made.

Possible resolution for #789

Example output:

The dotnet runtime version is '6.0.0-alpha.1.21064.11'.
Using MSBuild.exe located in '/usr/local/share/dotnet/sdk/6.0.100-alpha.1.21065.7/'.
Formatting code files in workspace '/Users/joeyrobichaud/Source/format/tests/projects/for_code_formatter/unformatted_project/unformatted_project.csproj'.
Loading workspace.
Project unformatted_project is using configuration from '/Users/joeyrobichaud/Source/format/.editorconfig'.
Project unformatted_project is using configuration from '/Users/joeyrobichaud/Source/format/tests/projects/for_code_formatter/unformatted_project/.editorconfig'.
Complete in 2167ms.
Determining formattable files.
Complete in 355ms.
Running formatters.
other_items/OtherClass.cs(5,3): Fix whitespace formatting. Delete 2 characters.
other_items/OtherClass.cs(6,3): Fix whitespace formatting. Delete 2 characters.
other_items/OtherClass.cs(7,5): Fix whitespace formatting. Delete 4 characters.
other_items/OtherClass.cs(8,5): Fix whitespace formatting. Delete 4 characters.
other_items/OtherClass.cs(9,7): Fix whitespace formatting. Delete 6 characters.
other_items/OtherClass.cs(10,5): Fix whitespace formatting. Delete 4 characters.
other_items/OtherClass.cs(11,3): Fix whitespace formatting. Delete 2 characters.
Program.cs(5,3): Fix whitespace formatting. Delete 2 characters.
Program.cs(6,3): Fix whitespace formatting. Delete 2 characters.
Program.cs(7,5): Fix whitespace formatting. Delete 4 characters.
Program.cs(8,5): Fix whitespace formatting. Delete 4 characters.
Program.cs(9,7): Fix whitespace formatting. Delete 6 characters.
Program.cs(10,5): Fix whitespace formatting. Delete 4 characters.
Program.cs(11,3): Fix whitespace formatting. Delete 2 characters.
other_items/OtherClass.cs(12,2): Fix final newline. Delete 1 characters.
Program.cs(12,2): Fix final newline. Delete 1 characters.
Complete in 544ms.
Formatted code file '/Users/joeyrobichaud/Source/format/tests/projects/for_code_formatter/unformatted_project/other_items/OtherClass.cs'.
Formatted code file '/Users/joeyrobichaud/Source/format/tests/projects/for_code_formatter/unformatted_project/Program.cs'.
Formatted 2 of 6 files.
Format complete in 3067ms.

Other types of messages:
Insert '\s\s'.
Replace 4 characters with '\t\t'.