ddev feat: add shell completion for `ddev config` and `ddev config global`

The Issue

ddev config and ddev config global should have autocompletion.

How This PR Solves The Issue

Adds autocompletion for ddev config and ddev config global with tests.
Updates description for some flags.

Manual Testing Instructions

ddev config --help
ddev config global --help

Press <TAB><TAB> with:

ddev config --project-type=
ddev config --php-version=
ddev config --router-http-port=
ddev config --router-https-port=
ddev config --xdebug-enabled=
ddev config --no-project-mount=
ddev config --omit-containers=
ddev config --omit-containers=db,
ddev config --omit-containers=ddev-ssh-agent,
ddev config --webserver-type=
ddev config --performance-mode=
ddev config --xhprof-mode=
ddev config --fail-on-hook-fail=
ddev config --mailpit-http-port=
ddev config --mailpit-https-port=
ddev config --project-tld=
ddev config --use-dns-when-possible=
ddev config --disable-settings-management=
ddev config --composer-version=
ddev config --bind-all-interfaces=
ddev config --database=
ddev config --nodejs-version=
ddev config --default-container-timeout=
ddev config --disable-upload-dirs-warning=
ddev config --corepack-enable=

Press <TAB><TAB> with:

ddev config global --omit-containers=
ddev config global --omit-containers=ddev-router,
ddev config global --omit-containers=ddev-ssh-agent,
ddev config global --instrumentation-opt-in=
ddev config global --router-bind-all-interfaces=
ddev config global --internet-detection-timeout-ms=
ddev config global --use-letsencrypt=
ddev config global --simple-formatting=
ddev config global --use-hardened-images=
ddev config global --fail-on-hook-fail=
ddev config global --performance-mode=
ddev config global --xhprof-mode=
ddev config global --table-style=
ddev config global --project-tld=
ddev config global --no-bind-mounts=
ddev config global --router-http-port=
ddev config global --router-https-port=
ddev config global --mailpit-http-port=
ddev config global --mailpit-https-port=
ddev config global --traefik-monitor-port=

Automated Testing Overview

Release/Deployment Notes

Jun 06 '25 14:06 stasadev

Download the artifacts for this pull request:

See Testing a PR.

Jun 06 '25 14:06 github-actions[bot]

Moving to draft until I understand how DDEV handles default config values.

If it doesn't work as I expected, it's not a big deal to partially revert my last commit here.

Jun 09 '25 17:06 stasadev

But it did not work with global on my setup:
$ ddev config global --database=<tab>
# alert signal.
$ ddev config global --database <tab>
-- file --
README.md          artisan*           composer.json      config/
Probably something in my setup though. 🤷

@tyler36, there is no such flag in global.

Thanks for testing!

Jun 13 '25 05:06 stasadev