PatchEnvelopes: move PatchEnvelopeAppUsage from App to Metrics

[uncleDecart]

For API changes see lf-edge/eve-api#39

Needs to be merged after API changes

[eriknordmark]

LGTM but needs to be rebased on master and pull in new API version.

[codecov]

Codecov Report

Attention: 28 lines in your changes are missing coverage. Please review.

Comparison is base (b3d1d28) 19.61% compared to head (fc7f4be) 19.60%.
Report is 3 commits behind head on master.

Files	Patch %	Lines
pkg/pillar/cmd/volumemgr/initialvolumestatus.go	0.00%	5 Missing ⚠️
pkg/pillar/cmd/volumemgr/updatestatus.go	0.00%	5 Missing ⚠️
pkg/pillar/containerd/containerd.go	0.00%	5 Missing ⚠️
pkg/pillar/cmd/volumemgr/blob.go	0.00%	4 Missing ⚠️
pkg/pillar/cmd/volumemgr/handlevolume.go	0.00%	4 Missing ⚠️
pkg/pillar/cmd/zedagent/handlepatchenvelopes.go	0.00%	3 Missing ⚠️
pkg/pillar/cmd/zedagent/handlemetrics.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3664      +/-   ##
==========================================
- Coverage   19.61%   19.60%   -0.01%     
==========================================
  Files         232      232              
  Lines       50746    50770      +24     
==========================================
  Hits         9954     9954              
- Misses      40069    40092      +23     
- Partials      723      724       +1     

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