add shell completion to homebrew

[electriquo]

Please consider opening a discussion in ideas category if applicable. Your feature will be prioritized on based on the number of votes.

Is your feature request related to a problem? Please describe.
when using brew to install jira-cli, it does not add the shell completion by default like other formulas do. e.g.:

• https://github.com/Homebrew/homebrew-core/blob/3c144eb3f0c750fcb791c4916e6ccb9497edad89/Formula/nvm.rb#L31
• https://github.com/Homebrew/homebrew-core/blob/3c144eb3f0c750fcb791c4916e6ccb9497edad89/Formula/awscli.rb#L118-L120

Describe the solution you'd like
add shell completion to the jira-cli formula

Describe alternatives you've considered
Adding shell completion manually, which does not get update each release