feat(cmd): add templates apply/publish/metadata/generate-docs commands

[skevetter]

Summary

Adds a new templates command group with four subcommands for devcontainer template management via OCI registries:

• templates apply — fetches a template from an OCI registry and scaffolds devcontainer configuration into a workspace folder, with support for template variable substitution, feature injection, and path omission
• templates publish — packages a local template directory and pushes it to an OCI registry
• templates metadata — pulls and displays the devcontainer-template.json metadata for a published template
• templates generate-docs — discovers local template metadata files and generates markdown documentation

Follows existing cobra command patterns (mirrors cmd/pro/pro.go). Reuses OCI pull infrastructure from pkg/devcontainer/feature/. Includes E2E tests for apply and metadata against ghcr.io/devcontainers/templates.

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⚙️ Run configuration

Configuration used: Organization UI

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Run ID: c6a9c541-2e1a-4b7c-bfb0-0b8bee1c7632

📥 Commits

Reviewing files that changed from the base of the PR and between be8aeac and b3ffe7b.

📒 Files selected for processing (8)

• cmd/root.go
• cmd/templates/apply.go
• cmd/templates/generate_docs.go
• cmd/templates/metadata.go
• cmd/templates/publish.go
• cmd/templates/templates.go
• e2e/e2e_suite_test.go
• e2e/tests/templates/templates.go

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