CliIoHost exists today as a singleton pattern. However this creates an issue if someone wanted to do parrallel executions of the Cli i.e.

Promise.all([
    myToolkit.deploy(appA),
    myToolkit.deploy(appB)
]);

or if someone wanted to maintain multiple distinct copies of the tookit

const myAwesomeToolkitA = new Toolkit({
    ioHost: myCustomIoHost()
})

const myAwesomeToolkitB = new Toolkit({
    ioHost: myOtherCustomIoHost()
})

This is done if:

• The singleton pattern is gone
• Anywhere the the Cli was calling a log function i.e. info() is now changed to a IoHost.notify().
• Log functions should return a formatted IoMessage, i.e. IoHost.notify(info('my message')) or some equivalent functionality

Singleton Implementation Pr:
#32708