[cli] fast refresh

[twlite]

Allow reloading the changes without restarting the bot when possible

[twlite]

How to make this happen?

• we keep track of what files are modified, if files inside validations/commands/events are changed, we can simply invoke reload method of commandkit
• if main file is changed, we definitely need to restart the process from scratch
• if any of the files imported by main file gets updated, we need to trigger restart (need to keep track of imports for this somehow)

[twlite]

https://www.npmjs.com/package/precinct

[NotM1Dev]

https://www.npmjs.com/package/chokidar

[twlite]

We need to preserve client's connection while reloading the project. Simple fs-watch won't be enough for this.