feat(master): [hybrid cloud] Support querying the inode count and used size of volumes and metapartitions by storage class.

[true1064]

…d size of volumes and metapartitions by storage class.

What this PR does / why we need it: feat(master): [hybrid cloud] Support querying the inode count and used size of volumes and metapartitions by storage class.

[codecov[bot]]

Codecov Report

Attention: 72 lines in your changes are missing coverage. Please review.

:exclamation: No coverage uploaded for pull request base (develop-hybridcloud-lifecycle@9802c8b). Click here to learn what that means.

Files	Patch %	Lines
master/meta_partition.go	33.33%	17 Missing and 5 partials :warning:
metanode/partition.go	0.00%	21 Missing :warning:
metanode/manager_op.go	0.00%	13 Missing :warning:
master/vol.go	59.09%	7 Missing and 2 partials :warning:
proto/meta_proto.go	0.00%	6 Missing :warning:
metanode/partition_fsm.go	0.00%	1 Missing :warning:

Additional details and impacted files

@@                       Coverage Diff                        @@
##             develop-hybridcloud-lifecycle    #3106   +/-   ##
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  Coverage                                 ?   41.28%           
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  Files                                    ?      577           
  Lines                                    ?   122413           
  Branches                                 ?        0           
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  Hits                                     ?    50543           
  Misses                                   ?    67467           
  Partials                                 ?     4403           

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