[Feature request] Support for stratis pool and filesystem

[folliehiyuki]

This issue requests the support to provision block devices as stratis pool and mount filesystems in the stratis pool as xfs. NixOS provides basic options to configure stratisd (fileSystems.<name>.stratis.poolUuid and services.stratis.enable).

Since stratis is designed to be similar to zfs structurally, the configuration can look like this:

{
  disko.devices = {
    disk = {
      x = {
        type = "disk";
        device = "/dev/sda";
        content = {
          type = "gpt";
          partitions = {
            stratis = {
              size = "100%";
              content = {
                type = "stratis";
                pool = "spool";
              };
            };
          };
        };
      };
      
      stratis-pool.spool = {
        type = "stratis-pool";
        # Options passed to `stratis pool create`
        options = {};
        filesystems = {
          data = {
            type = "xfs";
            mountpoint = "/<some_mount_point>";
            # Options passed to `stratis filesystem create`
            options = {};
          };
        };
      };
    };
  };
}

Ref: https://stratis-storage.github.io/