Add x-request-id capture and instance download --debug flag

[ronpal]

Summary

• Capture the x-request-id response header into ErrorDetails/SuccessResponse and surface it on ToolkitAPIError (message + as_debug_dict), so 408 graph-query timeouts can be correlated with server-side/PG3 logs.
• Add a --debug flag to cdf data download instances that, behind one flag:
  • requests server-side query profiling via QueryDebugParameters(profile=True) (query endpoint only), logging the returned plan, and
  • logs per-page diagnostics (endpoint, page size, truncated cursor, elapsed time, x-request-id), including on the 408 reduce-load path where the page size is halved.
• Threaded a debug parameter through InstanceIO → InstancesAPI.paginate/iterate/query/query_iterate down to _make_query.

Context

Investigating intermittent 408s while paging a view that maps multiple containers (multi-container joins in PG3 under IOPS contention). The reduce-load-on-408 behavior already exists on the query endpoint; this PR adds the observability needed to attribute and trace those timeouts.

Test plan

• mypy clean on changed modules
• test_http_client.py: request-id captured on success and failure responses
• test_instance_io.py: --debug injects {"debug": {"profile": true}} into the query body
• Manual: run an instance download with --debug against a project and confirm profiling/log output

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