feat: delayed ground truth tutorial (POC)

[tomtranjr]

summary

• POC for New input and delayed ground truth simulation #65: simulate incoming data with delayed ground truth
• trains on first 40% of housing dataset, streams remaining 60% in 5 batches, ground truth written 30s after each batch is scored
• new folder example/tutorial_streaming/, reuses existing train/register/drift/grafana scripts unchanged

test plan

• unit tests pass (pytest)
• manual run against a deployed stack

follow-up (not in this PR)

• replace wall-clock sleep with backdated timestamps
• promote to a deployml tutorial CLI command with dataset upload support

related

• closes New input and delayed ground truth simulation #65

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