Split GRPC code of related contexts into separate files

[6543]

from #796

[codecov-commenter]

Codecov Report

Merging #798 (ef1220a) into master (8ae124d) will decrease coverage by 0.09%.
The diff coverage is n/a.

❗ Current head ef1220a differs from pull request most recent head bed64ac. Consider uploading reports for the commit bed64ac to get more accurate results

@@            Coverage Diff             @@
##           master     #798      +/-   ##
==========================================
- Coverage   55.99%   55.90%   -0.10%     
==========================================
  Files          76       76              
  Lines        5543     5543              
==========================================
- Hits         3104     3099       -5     
- Misses       2266     2271       +5     
  Partials      173      173              

Impacted Files	Coverage Δ
server/logging/log.go	48.83% <0.00%> (-5.82%)	⬇️

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