intermediate table for bwaggregator

[kunwh]

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Description:

Related to #9145

• Firstly, add the intermediate for bwaggregator trades

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quick links for more information:

• README.md
• spellbook docs
• CONTRIBUTING.md

[cursor]

PR Summary

Introduces an intermediate view to surface Bitget Wallet Aggregator trades from dex.trades.

• New bwaggregator.trades view with expose_spells post-hook; chains: arbitrum, base, bnb, ethereum, polygon
• Filters trades by aggregator contract tx_to or matching paymaster events in evms.logs (topic0), with cutoff block_date >= 2025-10-01
• Derives version from paymaster event or tx_to (v1/v2); includes standard trade fields and sets trace_address to [-1]
• Adds _schema.yml with model metadata, tags, description, and column docs

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[kunwh]

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