feature: add git_clone, list_sandboxes, and manage_sandbox tools

[hjpinheiro]

Summary

Three new tools for development workflow and resource management:

Tool	Purpose	SDK API
git_clone	Clone a Git repository into a sandbox	sandbox.git.clone(url, path, branch, commit_id, username, password)
list_sandboxes	List all sandboxes with IDs and states	daytona.list(query=ListSandboxesQuery(limit=N))
manage_sandbox	Lifecycle: start, stop, archive	sandbox.start() / sandbox.stop() / sandbox.archive()

Design

• git_clone: Supports branch selection, specific commit checkout, and username/password authentication for private repos
• list_sandboxes: Returns structured list with ID, name, and state for each sandbox
• manage_sandbox: Single tool with action select parameter (start/stop/archive) — avoids adding 3 separate tools for related operations
  • start: resumes a stopped/archived sandbox (calls start() + wait_for_sandbox_start())
  • stop: pauses a running sandbox (filesystem preserved, costs reduced)
  • archive: compresses for long-term storage (minimal cost, slower resume)
  • Uses daytona.get() directly instead of get_sandbox() to avoid unintended auto-start when stopping/archiving

These complement the existing create_sandbox/destroy_sandbox tools to provide full lifecycle management:

create → [manage: start/stop/archive] → destroy

Testing

• All 3 .py files pass py_compile
• All 3 .yaml files pass yaml.safe_load
• provider/daytona.yaml validates with 10 total tools (7 original + 3 new)