fix(logging.go): changing marshaler for JSON logging to use gogo

[igaskin]

grpc-gateway json marshaler breaks with gogo protos

#4117

This issue is related to gogo/protobuf#212 (comment)

argocd cli

$ argocd proj create foo
EE: 0/[]

argocd server corrected output

{"grpc.code":"OK","grpc.method":"Create","grpc.service":"project.ProjectService","grpc.start_time":"2020-09-13T19:41:03-07:00","grpc.time_ms":15.292,"level":"info","msg":"finished unary call with code OK","span.kind":"server","system":"grpc","time":"2020-09-13T19:41:03-07:00"}

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• I've signed the CLA and my build is green (troubleshooting builds).

[codecov-commenter]

Codecov Report

Merging #4319 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4319   +/-   ##
=======================================
  Coverage   42.77%   42.77%           
=======================================
  Files         124      124           
  Lines       18411    18411           
=======================================
  Hits         7876     7876           
  Misses       9517     9517           
  Partials     1018     1018           

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[mayzhang2000]

LGTM