Add FAIR repair

[badrogger]

This pull request introduces several changes to improve the functionality and maintainability of the node_cli codebase. The changes include refactoring methods, renaming functions for clarity, adding new utility functions, and updating the logic for handling Fair node operations. Below is a summary of the most important changes, grouped by theme.

Refactoring and Code Simplification:

• Reorganized imports across multiple files to improve readability and maintain alphabetical order. (node_cli/cli/fair_node.py, node_cli/core/node.py, node_cli/operations/fair.py)
• Renamed several functions for clarity, such as stop_container to stop_container_by_name and rm_container to remove_container_by_name. (node_cli/utils/docker_utils.py, [1] [2]

Fair Node Operations:

• Replaced the request_repair function with a new repair_chain function, which integrates the repair_fair_op operation for better modularity. (node_cli/fair/fair_node.py, [1] [2]
• Updated the repair command to use repair_chain and added the @streamed_cmd decorator for improved command output handling. (node_cli/cli/fair_node.py, node_cli/cli/fair_node.pyL133-R135)

Cleanup and Volume Management:

• Refactored the cleanup_datadir_for_single_chain_node function into cleanup_datadir_content and cleanup_no_lvm_datadir for better separation of concerns and reusability. (node_cli/core/schains.py, node_cli/core/schains.pyL256-R304)
• Added a new utility function cleanup_dir_content to remove the contents of a directory while preserving the directory itself. (node_cli/utils/helper.py, node_cli/utils/helper.pyR327-R337)

Utility Enhancements:

• Introduced a new function is_btrfs_subvolume to check if a given path is a Btrfs subvolume, improving the handling of Btrfs-specific operations. (node_cli/utils/helper.py, node_cli/utils/helper.pyR416-R424)
• Added logic to ensure the correct container name is used when checking if an admin container is running for different node types. (node_cli/utils/docker_utils.py, node_cli/utils/docker_utils.pyR406-R411)

Functionality Updates:

• Updated the restore and update operations for Fair nodes to align with the new function naming conventions and improved logic. (node_cli/operations/fair.py, [1] [2]
• Modified the default value for the --snapshot-from option in the repair command from an empty string ('') to None for better type consistency. (node_cli/cli/fair_node.py, node_cli/cli/fair_node.pyL122-R122)

[dmytrotkk]

suggest to rename

[dmytrotkk]

remove comment