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Refactor and Fix Ghost Chain Consensus - #1

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This change refactors and fixes several issues in the pallet-ghost-consensus of the Ghost blockchain. It addresses critical bugs, completes the slashing implementation, optimizes the code, and adds a comprehensive test suite. The dependency management has also been improved by removing the polkadot-sdk submodule and adding a Cargo.lock file.


PR created automatically by Jules for task 2842646807561725150

This commit addresses several issues in the `pallet-ghost-consensus` and improves the overall structure and functionality of the Ghost blockchain.

- **Fix Critical Bugs:**
  - Implemented a mechanism to track miners for each block to enable proper reward distribution.
  - Replaced direct balance manipulation with safe Substrate APIs for reward distribution and slashing.
  - Corrected the `stake` and `unstake` functions to use the correct `transfer` function from `pallet-balances`.
- **Complete the Slashing Implementation:**
  - Implemented the `check_slashing_conditions` and `apply_slashing` functions.
  - Added an `on_initialize` hook to periodically check for validator downtime and apply slashing as needed.
- **Refactor and Optimize:**
  - Removed the unused `verify_pow` functions to clean up the codebase.
  - Optimized the PoS validator selection process to improve performance by adding a `TotalStake` storage item.
- **Add Comprehensive Tests:**
  - Added a test suite with mocks for the `pallet-ghost-consensus` to enable unit testing.
- **Dependency Management:**
  - Removed the `polkadot-sdk` git submodule and added a `Cargo.lock` file to ensure reproducible builds.
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