ctest: Add CLI argument spell checking

Use Levenshtein distance to track when the user may have made a typo in
an argument to `ctest`.

Source/cmCTest.cxx

@@ -2615,7 +2615,15 @@ int cmCTest::Run(std::vector<std::string> const& args)
       }
     }
     if (!matched && cmHasPrefix(arg, '-') && !isPresetArgument(arg)) {
-      cmSystemTools::Error(cmStrCat("Unknown argument: ", arg));
+      std::string error = cmStrCat("Unknown argument: ", arg);
+      std::vector<CommandArgument> allArguments = arguments;
+      cm::append(allArguments, presetArguments);
+      std::string const suggestion =
+        cmFindClosestCommandLineArgument(arg, allArguments);
+      if (!suggestion.empty()) {
+        error = cmStrCat(error, ". Did you mean: ", suggestion, '?');
+      }
+      cmSystemTools::Error(error);
       cmSystemTools::Error("Run 'ctest --help' for all supported options.");
       return 1;
     }

Tests/RunCMake/CTestCommandLine/RunCMakeTest.cmake

@@ -951,6 +951,7 @@ endfunction()
 run_output_junit_invalid()
 
 run_cmake_command(invalid-ctest-argument ${CMAKE_CTEST_COMMAND} --not-a-valid-ctest-argument)
+run_cmake_command(invalid-ctest-argument-did-you-mean ${CMAKE_CTEST_COMMAND} --parallell 2)
 
 block()
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/TimeoutDefault)

Tests/RunCMake/CTestCommandLine/invalid-ctest-argument-did-you-mean-result.txt

@@ -0,0 +1 @@
+1

Tests/RunCMake/CTestCommandLine/invalid-ctest-argument-did-you-mean-stderr.txt

@@ -0,0 +1,2 @@
+CMake Error: Unknown argument: --parallell\. Did you mean: --parallel\?
+CMake Error: Run 'ctest --help' for all supported options\.