Refactor uptime tracking

[ceyonur]

Why this should be merged

Current VM package was operating state + uptime manager together and had an increased Initialialize complexity. This PR is to move that to another component.

How this works

This pull request introduces significant changes to the validator management system in the subnet-evm plugin. The main focus is on refactoring the code to use a new validatorsManager for managing validators instead of the previous validatorState and uptimeManager. Additionally, it includes the introduction of new interfaces and restructuring of existing code to improve modularity and maintainability.

Key changes include:

Refactoring and Code Improvements:

• Refactored the GetCurrentValidators function in plugin/evm/service.go to use validatorsManager instead of validatorState for retrieving validator information.
• Introduced new interfaces in plugin/evm/validators/interfaces/interfaces.go to define ValidatorReader and Manager for better abstraction and modularity.
• Added a new manager implementation in plugin/evm/validators/manager.go to handle validator synchronization and state management.

Testing Enhancements:

• Added comprehensive tests in plugin/evm/validators/manager_test.go to validate the new validator management functionality, including scenarios for adding, updating, and removing validators.

File Restructuring:

• Renamed and moved several files for better organization, including renaming plugin/evm/validators/codec.go to plugin/evm/validators/state/codec.go and plugin/evm/validators/interfaces/interface.go to plugin/evm/validators/state/interfaces/state.go. [1] [2]

Code Cleanup:

• Removed the noop_state.go file from plugin/evm/validators/validatorstest as it is no longer needed.

These changes collectively aim to enhance the maintainability and functionality of the validator management system in the subnet-evm plugin.

How this was tested

Locally and UTs

Need to be documented?

No

Need to update RELEASES.md?

No