[WIP] Add new crate db-evm-dex with Clickhouse and Postgres

[Copilot]

• Create db-evm-dex engine-agnostic crate (rename/restructure from clickhouse-evm-dex)
  • Create db-evm-dex/Cargo.toml
  • Create db-evm-dex/src/ with all Rust source files (lib.rs, logs.rs, store.rs, transactions.rs, and all DEX modules)
  • Create db-evm-dex/substreams.yaml (engine-agnostic, no sink config)
  • Create db-evm-dex/Makefile
• Create db-evm-dex-clickhouse crate (Clickhouse-specific sink config + schemas)
  • Create db-evm-dex-clickhouse/substreams.yaml (imports db-evm-dex, clickhouse sink)
  • Create db-evm-dex-clickhouse/Makefile
  • Copy schema files from clickhouse-evm-dex
• Create db-evm-dex-postgres crate (Postgres-specific sink config + schemas)
  • Create db-evm-dex-postgres/substreams.yaml (imports db-evm-dex, postgres sink)
  • Create db-evm-dex-postgres/Makefile
  • Create db-evm-dex-postgres/schema.sql (Postgres DDL)
  • Create db-evm-dex-postgres/docker-compose.yml
  • Create db-evm-dex-postgres/README.md
  • Create db-evm-dex-postgres/.gitignore
• Update workspace Cargo.toml to include new db-evm-dex member
• Verify build compiles

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create new crate "db-evm-dex-*"</issue_title>
<issue_description>Similar structure to db-evm-transfers

• add Clickhouse
• add Postgres</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create new crate "db-evm-dex-*" #120

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