[IMPROVEMENT] Check kernel module `dm_crypt` on host machines

[derekbit]

Is your improvement request related to a feature? Please describe (👍 if you like this request)

1. Add the necessary dm_crypt kernel module for encrypted volumes in the official document
2. Add the necessary dm_crypt kernel module check in the node.status.conditions
3. Add the necessary dm_crypt kernel module check in the longhornctl

Describe the solution you'd like

Describe alternatives you've considered

Additional context

https://github.com/longhorn/longhorn/issues/9135

Tasks

• [ ] doc: The documentation for the necessary dm_crypt kernel module for encrypted volumes
• [ ] longhorn-manager: dm_crypt kernel module check in the node.status.conditions
• [x] cli: dm_crypt kernel module check