Add grpc keepalive config

[taktv6]

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[codecov-io]

Codecov Report

Merging #242 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #242   +/-   ##
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  Coverage   59.15%   59.15%           
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  Files         137      137           
  Lines        7423     7423           
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  Hits         4391     4391           
  Misses       2853     2853           
  Partials      179      179

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[hikhvar]

This requires every RIS client to use also the google.golang.org/grpc/keepalive library?

LGTM.