Feature request: tab completion for shells (zsh, bash, ...)

[VorpalBlade]

It would be nice to be able to tab complete the parameters and sub-commands. I believe the required files can be generated very easily using clap_complete since you already use clap for command line handling.

This can be setup in build.rs even, to not introduce extra run time dependencies (though I'm not sure how that interacts with cargo install).

For me this would be useful for the standalone espflash tool, as well as cargo-espflash

[jessebraham]

Thanks for opening this issue. You're right, this would be really nice to have! I've definitely thought of this before as well. Can't give you a timeline right now (been pretty distracted with other projects) but will definitely get this added at some point.