This commit adds a --completion-bash option to node which can be
sourced to provide bash code completion for node options.
Usage:
$ node --completion-bash > node_bash_completion
$ source node_bash_completion
$ node --[tab]
PR-URL: https://github.com/nodejs/node/pull/20713
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
