feat(cloud): add GET /tasks endpoint to list all tasks

[joshrotenberg]

Summary

Add support for listing all tasks via the GET /tasks endpoint.

Current state

We have:

• cloud task get <id> - Get a specific task
• cloud task wait <id> - Wait for task completion
• cloud task poll <id> - Poll task with live updates

Missing

• GET /tasks - List all tasks

Implementation

Library (redis-cloud)

The handler likely already exists in crates/redis-cloud/src/tasks.rs. Verify and add if missing.

CLI (redisctl)

Add cloud task list command to crates/redisctl/src/commands/cloud/task.rs

Notes

• Good first issue - straightforward list endpoint
• Should support filtering by status if API allows