[DONT MERGE] [WIP] Add SDK methods and CLI commands for managing search downloads

[tomaz-lc]

Description

This PR implements SDK methods and CLI commands for managing search downloads (WIP functionality which hasn't been released yet and it's under development).

Changes

• Add SDK methods to Manager.py for all search download operations (initiate, status, list, cancel, wait)
• Create new SearchDownload.py CLI module with subcommands for managing download jobs
• Wire up search-download action in main CLI entry point
• Auto-generate long-lived JWT tokens (8 hours default) when starting download jobs

SDK Methods

Method	Description
getJWT(expiry_seconds)	Generate JWT with custom expiry timestamp
initiateSearchDownload()	Start a new download job with query parameters
getSearchDownloadStatus()	Get detailed status of a job by ID
listSearchDownloads()	List all download jobs with pagination
cancelSearchDownload()	Cancel a running job
waitForSearchDownload()	Poll until completion with optional callback

CLI Usage

# Start a download job (auto-generates 8-hour token)
limacharlie search-download start -q "event_type:NEW_PROCESS" -s now-1h -e now

# Start and wait for completion
limacharlie search-download start -q "event_type:NEW_PROCESS" -s now-1h -e now --wait

# Custom token lifetime (10 hours)
limacharlie search-download start -q "*" -s now-6h -e now --token-hours 10

# Check job status
limacharlie search-download status <job-id>

# List all jobs
limacharlie search-download list --limit 10

# Wait for completion with progress
limacharlie search-download wait <job-id>

# Get download URL
limacharlie search-download url <job-id>

# Cancel a job
limacharlie search-download cancel <job-id>

# JSON output for scripting
limacharlie search-download start -q "*" -s now-1h -e now --json
limacharlie search-download status <job-id> --json

Related PRs

• Changes for generating token with custom expiration time - Add get-token command for generating JWTs with custom expiry #202