[lldb] Add more command option mnemonics (#155705)

Add a bunch of mnemonics to the command options now that they're
highlighted in the help output. This uncovered two issues:

 - We had an instance where we weren't applying the ANSI formatting.
 - We had a place where we were now incorrectly computing the column
   width.

Both are fixed by this PR.

Author: JDevlieghere

lldb/include/lldb/Utility/AnsiTerminal.h

@@ -260,6 +260,11 @@ inline std::string TrimAndPad(llvm::StringRef str, size_t visible_length,
   return result;
 }
 
+inline size_t ColumnWidth(llvm::StringRef str) {
+  std::string stripped = ansi::StripAnsiTerminalCodes(str);
+  return llvm::sys::locale::columnWidth(stripped);
+}
+
 } // namespace ansi
 } // namespace lldb_private