Add metric to capture kafka errors

[abaiken]

Closes #234

1. Bring up local development - follow the prometheus/grafana instructions
2. Either send a lot of reports & kill the file upload service during that or you can bring up the server without the file upload service running. (graphs can be finicky - so play around with it)

[codecov-io]

Codecov Report

Merging #245 into master will increase coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #245      +/-   ##
==========================================
+ Coverage    96.3%   96.31%   +<.01%     
==========================================
  Files          28       28              
  Lines        2357     2362       +5     
  Branches      280      280              
==========================================
+ Hits         2270     2275       +5     
  Misses         43       43              
  Partials       44       44

Impacted Files	Coverage Δ
yupana/processor/report_slice_processor.py	91.8% <100%> (+0.13%)	:arrow_up:
yupana/processor/report_processor.py	94.15% <100%> (ø)	:arrow_up:
yupana/processor/report_consumer.py	93.67% <100%> (+0.24%)	:arrow_up:

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