python(feat): add progress indicators for job polling and file downlo…

[wei-qlu]

What changed

• Added progress indicators to wait_until_complete and wait_and_download using alive-progress.
  • Job polling: animated spinner with live status updates (CREATED → RUNNING → FINISHED).
  • File downloads: determinate progress bar with byte counts and speed.
• New show_progress parameter on both methods — defaults to True for sync, False for async.
• Global override via sift_client.config.show_progress (None = use defaults, True/False = force everywhere).
• Added Config dataclass singleton in sift_client/config.py for global settings — typos raise AttributeError.

Validation

• Existing unit/integration tests pass.
• Manual export with show_progress=True:

Job status: RUNNING █▆▄▂▂ in 4s

Job 07de79a4-7a55-491f-8ed5-d1497c182fcf (data_export): FINISHED in 5.3s
Downloading |████████████████████████████████████████| 784.6kB/784.6kB [100%] in 0.1s (7.69MB/s)

[nathan-sift]

looks good!

[alexluck-sift]

Have you done any testing to make sure this behaves as expected with our sync wrapping of async?

[wei-qlu]

Have you done any testing to make sure this behaves as expected with our sync wrapping of async?

added tests for wait_until_complete / wait_and_download with the sync_wrapper