feat: add zfs modules

- add zfs_core module to puppetfile (provides zfs/zpool provider)
- add module to manage zfs

modules/zfs/lib/facter/zfs_zpool_cache_present.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+Facter.add('zfs_zpool_cache_present') do
+  confine kernel: 'Linux'
+  setcode do
+    File.exist?('/etc/zfs/zpool.cache')
+  end
+end
+
+Facter.add('zfs_zpool_cache_present') do
+  setcode do
+    false
+  end
+end