Add Kaia CEX addresses and flows

[JoongJePark]

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Description:

Summary

• Added 69 Kaia CEX addresses to cex_evms_addresses.sql
• Created cex_kaia_addresses.sql model following EVM chain pattern
• Created cex_kaia_flows.sql model for Kaia CEX flow tracking
• Updated cex_addresses.sql to include Kaia in aggregation
• Added Kaia to expose_spells configuration
• Added schema definitions for Kaia CEX models

Contributor

anton

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quick links for more information:

• README.md
• spellbook docs
• CONTRIBUTING.md

[github-actions]

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[JoongJePark]

I have read the CLA Document and I hereby sign the CLA

[cursor]

PR Summary

Adds Kaia support to the CEX sector.

• Adds Kaia to expose_spells and includes cex_kaia_addresses in cex_addresses.sql aggregation
• Creates cex_kaia_addresses.sql (EVM pattern via cex_evms) and cex_kaia_schema.yml; incremental with merge on blockchain,address
• Seeds 69 Kaia CEX addresses in cex_evms_addresses.sql (multiple exchanges)
• Introduces cex_kaia_flows.sql using cex_flows and registers schema in _schema.yml; incremental merge keyed by flow_type, unique_key

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