[CoW Protocol] Second part of Plasma integration

[bram-vdberg]

Description:

This PR concludes the CoW integration for Plasma network.

[cursor]

PR Summary

Adds CoW Protocol Plasma support with new batches, solvers, and ETHFlow orders models, and includes Plasma in the aggregated batches output.

• Data models (dbt):
  • Plasma integration:
    • Add cow_protocol_plasma_batches incremental model joining settlements/interactions, prices, and transactions to compute num_trades, dex_swaps, fee_value, tx_cost_usd, call_data_size, etc.
    • Add cow_protocol_plasma_eth_flow_orders incremental model parsing ETHFlow order placements/calls and deriving order_uid plus order fields.
    • Add cow_protocol_plasma_solvers model consolidating allowlist events with known solver metadata and active status.
    • Add cow_protocol_plasma_schema.yml with meta/tags and tests (e.g., unique tx_hash).
  • Aggregate batches:
    • Update cow_protocol_batches.sql to UNION cow_protocol_plasma_batches as blockchain plasma.

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