Honor socket keepalive settings

[danielealbano]

This PR implements 3 new network io functions to set the keepalive idel, interval and count and update the mechanism used to enable / disable the keepalive to:

• set the keepalive parameters only if the keepalive block is present in the configuration
• do not fail, only report a warning, if the keepalive parameters are for some reason refused

The PR closes #84

[codecov[bot]]

Codecov Report

Merging #180 (9a8e924) into main (6d895df) will decrease coverage by 0.19%. The diff coverage is 44.44%.

@@            Coverage Diff             @@
##             main     #180      +/-   ##
==========================================
- Coverage   79.08%   78.89%   -0.19%     
==========================================
  Files         105      105              
  Lines        6749     6765      +16     
==========================================
  Hits         5337     5337              
- Misses       1412     1428      +16     

Impacted Files	Coverage Δ
src/network/channel/network_channel.c	92.54% <ø> (-0.11%)	:arrow_down:
src/worker/network/worker_network_iouring_op.c	63.86% <9.09%> (-3.89%)	:arrow_down:
src/network/io/network_io_common.c	94.30% <100.00%> (+0.22%)	:arrow_up:
src/slab_allocator.c	94.87% <0.00%> (-2.56%)	:arrow_down:
src/network/network.c	78.52% <0.00%> (-1.48%)	:arrow_down:
src/spinlock.c	96.15% <0.00%> (+7.69%)	:arrow_up:

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