feat(fortuna): support multiple RPC endpoints with failover capability

[devin-ai-integration]

Update fortuna to support multiple RPC endpoints for each chain with failover capability. This allows users to specify a list of RPC endpoints for each chain, and fortuna will try each one in sequence if previous ones fail.

Changes:

• Update EthereumConfig to accept a list of RPC addresses instead of a single geth_rpc_addr parameter
• Create a new FailoverMiddleware in the eth_utils directory to handle failover between multiple RPC endpoints
• Update code that uses EthereumConfig to work with multiple RPC endpoints
• Update version number following semantic versioning (patch increment)

Testing:

• Tested locally with multiple RPC endpoints and verified failover works correctly
• Ran pre-commit hooks to ensure code quality

Link to Devin run: https://app.devin.ai/sessions/f40b14d0f03243be8df5f158f048cd6e
Requested by: Jayant Krishnamurthy ([email protected])

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