Add additional readline-like keybindings. (#524)

Adds the following conventional readline-like keybindings:

  - `Ctrl+H`: Delete the previous character.
  - `Ctrl+D`: Delete the next character.

Additionally, remaps the Debug Console command from Ctrl+D to Ctrl+O, which had been first introduced in PR #486.

packages/cli/src/ui/components/DetailedMessagesDisplay.tsx

@@ -33,7 +33,7 @@ export const DetailedMessagesDisplay: React.FC<
       <Box marginBottom={1}>
         <Text bold color={Colors.Foreground}>
           Debug Console{' '}
-          <Text color={Colors.SubtleComment}>(CTRL-D to close)</Text>
+          <Text color={Colors.SubtleComment}>(CTRL-O to close)</Text>
         </Text>
       </Box>
       {messages.map((msg, index) => {