Writer Service: Use bam explorer api

[aoikurokawa]

• Use BAM api

[Copilot]

Pull Request Overview

This PR integrates the BAM API client to improve BAM validator detection by querying the BAM Explorer API instead of relying solely on validator history client type information.

Key Changes:

• Added BAM API client integration to fetch validators from the BAM Explorer API
• Updated BAM client detection logic to prioritize API data over validator history client types
• Added new optional bam_api_base_url configuration parameter throughout the application

Reviewed Changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
writer-service/src/stake_pool_manager.rs	Integrated BamApiClient as optional field, fetches validator set from BAM API
writer-service/src/result.rs	Added BamApiError to AppError enum for error handling
writer-service/src/main.rs	Added bam_api_base_url CLI argument
writer-service/src/lib.rs	Threaded bam_api_base_url parameter to StakePoolManager
core/src/fetcher.rs	Updated BAM detection logic to use API validator set when available
writer-service/Cargo.toml	Added bam-api-client dependency
core/Cargo.toml	Added bam-api-client dependency
Cargo.toml	Added bam-api-client dependency and upgraded solana-metrics
Cargo.lock	Updated dependencies including bam-api-client, solana-metrics, and transitive dependencies
docker-compose.yml	Added BAM_API_BASE_URL environment variable to services

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