feat(commander): support positional argument completions

[AmirSa12]

in this pr commander adapter now read the positional args. same as the other two adapters we have which finally makes us able not to skip the tests for this case.
before this PR, commander completions only worked for flags.

pnpm tsx examples/demo.commander.ts complete -- lint ""
main.ts  Main file
index.ts Index file
:4

[changeset-bot]

⚠️ No Changeset found

Latest commit: da9fed9

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@bomb.sh/tab@129

commit: da9fed9

[AmirSa12]

@shadowspawn your review is very appreciated! Thanks in advance ❤️

so commander already exposes what we need on each command .registeredArguments (https://github.com/tj/commander.js/blob/ba6d13ddb4243e5913367734f8c159089ffe7834/lib/command.js#L31C5-L31C35) so we now walk that list and register each positional with tab's command.argument