autocomplete: install script instead of generating it in shell config

[Codelax]

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Description

Currently, the autocomplete is installed by adding the script generation command to shell config (.bashrc), but the command scw autocomplete generate takes more than half a second to run, it should be quicker or we can generate this script once to the location of completion script for the used shell.

This would speed up the shell startup time.

How I imagine scw could expose this functionality

scw autocomplete install would install shell completion correctly

References

[Codelax]

Printing a couple lines of shell script is very slow

 ○ time scw autocomplete script shell=zsh
autoload -U compinit && compinit
_scw () {
	output=($(scw autocomplete complete zsh -- ${CURRENT} ${words}))
	opts=('-S' ' ')
	if [[ $output == *= ]]; then
		opts=('-S' '')
	fi
	compadd "${opts[@]}" -- "${output[@]}"
}
compdef _scw scw
scw autocomplete script shell=zsh  0.67s user 0.07s system 173% cpu 0.430 total

[Codelax]

First goal of this issue was to improve completion speed but this was solved in multiple perf PRs.
We should first work on generated scripts.
Lookup #1959 #2887 #2832 #2831