Replace github.com/golang/protobuf/proto with github.com/gogo/protobuf/proto

[linasm]

What this PR does / why we need it: A global find/replace of github.com/golang/protobuf/proto with github.com/gogo/protobuf/prototo avoid incompatibility surprises (previously there was a mix of the two being used, and we are actually generating protobuf with gogo).

Special notes for your reviewer: Adding a lint rule against future occurrences in https://github.com/m3db/m3/pull/2766.

Does this PR introduce a user-facing and/or backwards incompatible change?: NONE

Does this PR require updating code package or user-facing documentation?: NONE

[codecov[bot]]

Codecov Report

Merging #2767 (848d255) into master (57353bc) will decrease coverage by 26.9%. Report is 885 commits behind head on master. The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #2767      +/-   ##
=========================================
- Coverage    72.3%   45.5%   -26.9%     
=========================================
  Files        1080     214     -866     
  Lines       99481   18502   -80979     
=========================================
- Hits        71975    8420   -63555     
+ Misses      22518    9408   -13110     
+ Partials     4988     674    -4314     

Flag	Coverage Δ
aggregator	55.8% <ø> (-20.0%)	:arrow_down:
cluster	∅ <ø> (∅)
collector	54.3% <ø> (-30.0%)	:arrow_down:
dbnode	?
m3em	46.4% <ø> (-28.0%)	:arrow_down:
m3ninx	?
metrics	19.8% <ø> (ø)
msg	74.1% <ø> (-0.2%)	:arrow_down:
query	?
x	?

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