Implememt device, snapshot_policy and device_group

[taohe1012]

Add gen2 support for device, snapshot_policy and device_group.

All UT passed and coverage > 90%

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.26%. Comparing base (5d8c9db) to head (fc8058f).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
+ Coverage   94.74%   95.26%   +0.52%     
==========================================
  Files          56       62       +6     
  Lines        3443     3739     +296     
==========================================
+ Hits         3262     3562     +300     
+ Misses        181      177       -4     

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