feat(solana): add WhaleStreet DEX integration

[karimhass]

• Add WhaleStreet DEX models (stg_raw_swaps, base_trades, trades, schema)
• Uses optimized 3-step semi-join pattern for tokens_solana.transfers
• project_start_date 2026-02-03 with 1-day cap for CI efficiency
• Add whalestreet_solana_base_trades to dex_solana_base_trades union

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Description:

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quick links for more information:

• README.md
• spellbook docs
• CONTRIBUTING.md

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PR Summary

Medium Risk
Introduces new incremental models and expands the sector-wide dex_solana_base_trades union, which can affect downstream DEX aggregates and performance if the transfer matching logic is incorrect or expensive.

Overview
Adds WhaleStreet as a new Solana DEX source by introducing whalestreet_solana_stg_raw_swaps, whalestreet_solana_base_trades (incremental/merge), and a whalestreet_solana_trades view exposed via expose_spells.

The new pipeline extracts swaps from solana.instruction_calls for the WhaleStreet program and derives buy/sell legs by looking up matching SPL token transfers using an optimized semi-join/lookup pattern, then includes WhaleStreet output in the global dex_solana_base_trades UNION.

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Trades view uses expose_spells instead of hide_spells

Medium Severity

The whalestreet_solana_trades view uses expose_spells as its post_hook, but every other per-project DEX trades view (aquifer, goonfi, humidifi, obric, tessera, goosefx) uses hide_spells(). Only the main dex_solana_trades table uses expose_spells. This will incorrectly make the WhaleStreet convenience view publicly visible in Dune's data explorer (setting dune.public to true), when it is meant to be a hidden internal view that filters from the already-public dex_solana_trades.