[Jetstream] Iceberg + Glue setup

[dudu-theman]

Part of #138. Design doc: docs/design_docs/2026-07-13_bluesky_ingestion_jetstream.md

Create Iceberg tables for Bluesky posts, likes, reposts, and follows, partitioned by created_at_day under the proposed s3://lab-data-integrations-interface/bluesky/raw/<type>/ layout.

• One table per (platform, data_type), since column sets differ per type and users query one platform at a time.
• Iceberg owns the schema; Glue just points at the Iceberg metadata file.
• Chosen over partition projection because it works as well and sets us up better for deduplication.

[coderabbitai]

🔗 Related PRs

#94 - Glue tables [merged]
#118 - Design Doc: Bluesky Backfill App [open]
#127 - Add Iceberg write-amplification experiment [open]

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