Disable keep-alive in tcp connection

[lukasmittag]

We've seen 40 ms spikes periodically when meassuring latency. It seems if you disable keep-alive signals in tcp this issue goes away.

!!! DRAFT !!!

Not entirely sure this is the best way to go since channels might be closing the connection. See https://grpc.io/docs/guides/performance/#general

Will do some further tests.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 60.11%. Comparing base (95dcfcf) to head (88de4b9).
Report is 22 commits behind head on main.

Files with missing lines	Patch %	Lines
databroker/src/grpc/server.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #131      +/-   ##
==========================================
+ Coverage   59.64%   60.11%   +0.46%     
==========================================
  Files          33       33              
  Lines       15955    16191     +236     
==========================================
+ Hits         9517     9733     +216     
- Misses       6438     6458      +20     

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