[WIP] feat: support multi environment for proxy deployment

[kayagokalp]

Related to #7346

Summary

• Adds support for network-specific proxy addresses to solve multi-network deployment fragility
• Enables robust deployment workflows across testnet, mainnet, devnet, and local networks
• Maintains full backward compatibility with existing single proxy address configuration

Changes

• Proxy Configuration: Added addresses table for network-specific proxy addresses
• Network Resolution: Automatic network detection and proxy address resolution during deployment
• Manifest Updates: Network-aware proxy address writing and migration from single to multi-network format
• Validation: Mutual exclusivity validation between address and addresses fields
• Documentation: Updated with examples and migration guidance

Configuration Examples

Before (single network):

[proxy]
enabled = true
address = "0x1234..."

After (multi-network):

[proxy]
enabled = true

[proxy.addresses]
testnet = "0x1234..."
mainnet = "0x5678..."

Testing

• Comprehensive unit tests for network resolution and validation
• Integration tests for deployment workflows
• Backward compatibility verification

[codspeed-hq]

CodSpeed Performance Report

Merging #7355 will not alter performance

_{Comparing kayagokalp/proxy-multi-env (76c76a1) with master (6981d3d)}

Summary

✅ 25 untouched benchmarks