refactor: applying ibc simplification

[chatton]

Overview

This PR applies the ibc simplification logic introduced in the 01builders fork.

[gemini-code-assist]

Summary of Changes

Hello @chatton, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the validator set migration process within the 'migrationmngr' module by unifying the migration strategy. Previously, the system would perform a 'smoothed' migration over several blocks if IBC was detected, or an immediate migration otherwise. This change eliminates the conditional logic, ensuring all migrations are executed as a single, atomic update. This simplification reduces the module's complexity and maintenance overhead, making the migration mechanism more straightforward and predictable.

Highlights

• Simplified IBC Migration Logic: The module no longer distinguishes between IBC-enabled and IBC-disabled chains for migration, removing the 'smoothed' migration process.
• Atomic Migration: All validator set migrations are now performed in a single, atomic step at the migration start height.
• Removal of IBCSmoothingFactor: The concept and implementation of a multi-block smoothing factor for IBC migrations have been eliminated.
• Codebase Cleanup: Related code, including the 'isIBCEnabled' check, 'IbcKVStoreKeyAlias' type, and the 'migrateOver' function, has been removed, reducing complexity.
• Documentation Update: The 'README.md' has been updated to reflect the immediate, atomic nature of migrations and the revised chain halt timing.

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[gemini-code-assist]

Code Review

This pull request effectively simplifies the IBC migration logic by removing the 'smoothed' multi-block migration process in favor of a single, atomic update. The changes are consistently applied across the codebase, including documentation, dependency injection, keeper logic, and tests, which greatly improves code clarity and maintainability. My review includes a suggestion to enhance the documentation to make the operational impact on IBC users even clearer. Overall, this is a solid simplification of the module.