feat: 🕵️ Add Etherscan feature to stakewise adapter

[timbrinded]

• Add EtherscanLogsClient for fetching event logs via Etherscan API v2
• Etherscan queries are one-shot from block 0 (no chunking needed)
• Falls back to chunked RPC if Etherscan unavailable or fails
• New settings: etherscan_api_key

[Copilot]

Pull request overview

This PR adds Etherscan API integration to the StakeWise adapter to accelerate event log queries. Instead of chunked RPC queries scanning from a lookback block, the adapter can now fetch all historical logs in a single Etherscan API call from block 0. The implementation gracefully falls back to the existing chunked RPC approach if Etherscan is unavailable or fails.

Key changes:

• New EtherscanLogsClient for querying Etherscan API v2 with pagination, retry logic, and Web3 format conversion
• Refactored exit queue scanning logic to support both Etherscan and RPC paths
• New configuration settings for Etherscan API key and page size

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 8 comments.

File	Description
src/tq_oracle/settings.py	Added etherscan_api_key and etherscan_page_size settings to StakewiseAdapterSettings
src/tq_oracle/clients/etherscan_logs.py	New client implementing Etherscan API v2 logs endpoint with pagination, retry logic, and format conversion
src/tq_oracle/clients/__init__.py	Export EtherscanLogsClient from clients module
src/tq_oracle/adapters/asset_adapters/stakewise.py	Integrated Etherscan client with fallback logic; refactored exit queue scanning to extract _process_exit_logs, _scan_exit_queue_tickets_rpc, and _get_exit_logs_etherscan methods

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