feat: bt playgrounds list view rename delete

[Cedric / ViaDézo1er (viadezo1er)]

bt playgrounds list
bt playgrounds list --json
bt playgrounds view showcase-pg
bt playgrounds view showcase-pg --web
bt playgrounds view showcase-pg --json
bt playgrounds rename my-pg --new-name my-pg-renamed --force
bt playgrounds rename my-pg --description "A short description"
bt playgrounds rename my-pg --new-name my-pg-renamed --description "A short description" --force
bt playgrounds delete showcase-pg2
bt playgrounds delete showcase-pg3 --force

what's the description????

will have a follow up to create, download, update, run

[github-actions]

Latest downloadable build artifacts for this PR commit f4cc85bd05e1:

• Workflow run: https://github.com/braintrustdata/bt/actions/runs/28276523809
• Download all artifacts (GitHub CLI): gh run download 28276523809 --repo braintrustdata/bt
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