Add file-import commands to Tiger CLI

[MetalBlueberry]

Summary

• Add file-import commands for managing file imports via REST API
• Complete upload workflow with presigned URLs
• Support for listing, getting, and cancelling file imports
• CSV and Parquet file support with auto column mapping

Commands Added

• tiger file-import upload - Upload and import a file (complete workflow)
• tiger file-import list - List file imports with filtering
• tiger file-import get - Get file import details
• tiger file-import cancel - Cancel a running import

Changes

• OpenAPI spec: Added FileImport endpoints from savannah-public
• Generated API client: Auto-generated REST client methods for all FileImport operations
• CLI commands: Created internal/tiger/cmd/fileimport.go with full command implementation
• Root command: Added file-import to CLI command tree

Upload Workflow

The upload command provides a complete workflow:

1. Generates presigned S3 URL
2. Uploads file to S3
3. Creates file import with INTERNAL source
4. Waits for completion (by default, use --no-wait to skip)

Dependencies

Requires: timescale/savannah-public#61

Example Usage

# Upload a CSV file
tiger file-import upload data.csv --table my_table

# List recent imports
tiger file-import list --first 10

# Get import details
tiger file-import get cli-upload-1234567890

# Cancel an import
tiger file-import cancel cli-upload-1234567890 --confirm