refactor: merge cosmos-sdk and cosmos-sdk-union state modules into unified module

[DeVikingMark]

Summary

Consolidates two separate state modules (cosmos-sdk and cosmos-sdk-union) into a single unified module that supports both IBC Classic and IBC Union specifications.

Changes

• Merged modules: Combined voyager/modules/state/cosmos-sdk and voyager/modules/state/cosmos-sdk-union into single module
• Added specification switching: Automatic detection between IBC Classic/Union based on ibc_spec_id
• Unified configuration: Single config supporting both specs with optional ibc_host_contract_address for Union
• Removed duplication: Eliminated duplicate code and simplified architecture
• Updated dependencies: Combined Cargo.toml with dependencies for both specifications

Technical Details

• SupportedIbcSpec enum handles specification switching
• Runtime detection from StateModuleInfo.ibc_spec_id
• Backward compatible configuration
• Single binary replaces two separate modules

Files Changed

• voyager/modules/state/cosmos-sdk/src/main.rs - unified implementation
• voyager/modules/state/cosmos-sdk/Cargo.toml - merged dependencies
• Cargo.toml - removed cosmos-sdk-union from workspace
• Deleted: voyager/modules/state/cosmos-sdk-union/ directory

Fixes #3526

[vercel[bot]]

@DeVikingMark is attempting to deploy a commit to the unionbuild Team on Vercel.

A member of the Team first needs to authorize it.

[cor]

Thanks for contributing! Can you please make the CI checks pass?

[DeVikingMark]

@cor made some changes, I guess all the other ci's aren't related to my pr, isn't it?

[benluelo]

this fundamentally does not work. the referenced issue is old has been made irrelevant due to several refactors in the voyager design.