stripe-cli: use generate_completions_from_executable and add fish completion support

[cho-m]

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---

e.g. running commands:

❯ stripe completion --write-to-stdout --shell bash | head -5
# bash completion for stripe                               -*- shell-script -*-

__stripe_debug()
{
    if [[ -n ${BASH_COMP_DEBUG_FILE:-} ]]; then

❯ stripe completion --write-to-stdout --shell zsh | head -5
#compdef stripe

# zsh completion for stripe                               -*- shell-script -*-

__stripe_debug()

[github-actions]

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[chenrui333]

• feat: add fish shell completion support stripe/stripe-cli#1282

[github-actions]

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