Introduce deinit hook

[Oscaner]

Is your feature request related to a problem? Please describe.
I have a command to chain sub-commands, and I just want to run final postrun hook, but cannot.

Workflow:
-> [hook] init
-> [hook] prerun
-> [command] main
----> [hook] prerun
----> [command] sub1
----> [hook] postrun
----> [hook] prerun
----> [command] sub2
----> [hook] postrun
----> ...
-> [hook] postrun
-> [hook] deinit

Describe the solution you'd like
A clear and concise description of what you want to happen.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[mdonnalley]

@Oscaner why do you need to use a hook?

If you have a command that's chaining other commands, couldn't you just execute your "deinit" code at the end? This is what I'm imagining

class MyCommand extends Command {
  run() {
   // run "command one"
    await this.config.runCommand('command:one')
   // run "command two"
    await this.config.runCommand('command:two')
   // final logic here
  }
}

[Oscaner]

@Oscaner why do you need to use a hook?

If you have a command that's chaining other commands, couldn't you just execute your "deinit" code at the end? This is what I'm imagining

class MyCommand extends Command {
  run() {
   // run "command one"
    await this.config.runCommand('command:one')
   // run "command two"
    await this.config.runCommand('command:two')
   // final logic here
  }
}

For example, I init the Puppeteer browser in "init" hook, and cached the Browser in LRU-cache to globally reuse in every commands.

I don't want remove the Browser in every commands (this is why I cannot use "postrun" hook),
but want remove the Browser when the Chain command finished, or when I just run the independent command (command:one), also want to remove the Browser.

So I need "deinit" hook, just run once when command finished, even if this command contains multiple commands or not.

For another example, put some temporary files in local, and remove them when chain command finished, or independent command finished.

Thanks.