tty: improve color detection

1) Using `process.env.TERM = 'dumb'` should never return any colors.
2) `process.env.TERM = 'terminator'` supports 24 bit colors.
3) Add support for `process.env.TERM = 'rxvt-unicode-24bit'`
4) `Hyper` does not support true colors anymore. It should fall back
   to the xterm settings in regular cases.
5) `process.env.COLORTERM = 'truecolor'` should return 24 bit colors.

PR-URL: https://github.com/nodejs/node/pull/26264
Refs: https://github.com/nodejs/node/pull/26261


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>