Normalize some keystrokes

[shreeve]

Changes reset from Ctrl+D (usually for exiting a CLI program) -> Ctrl+R (for "reset"). Also, makes the output after a reset a little more clear.

[shreeve]

This PR goes with one for kaluma-cli at kaluma-project/kaluma-cli#36

[communix]

@shreeve The REPL command is compatible to the Node.js. So I want to keep the previous key.

[shreeve]

Ctrl+D exits the node REPL, no?

[shreeve]

$ node -v
v20.1.0

[communix]

@shreeve Yes, it's exit the node in Node.js.
For the reset, Kaluma provide .reset command and it's recommended for soft reset. The reason we add CTRL+D is it's like a exit in Kaluma.
Node.js runs on top of the shell and it goes to the shell when user want to exit from Node.js. Different from Node, Kaluma does not have any shell to go back. So when user want to exit it, Kaluma have to go back to Kaluma REPL. So it's the same as reset.