feat(commands): Adds autocompletion for all commands and subcommands

[jkuri]

No description provided.

[filipesilva]

Can confirm it works on windows gitbash, but requires a slightly different setup:

For windows gitbash:

ng completion >> ~/.bash_profile
source ~/.bash_profile

This is because gitbash start with --login, and that uses .bash_profile instead.

[filipesilva]

lgtm

[jkuri]

Thanks, let me add this to readme.

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