Dataset string memcap 3910/v6

[inashivb]

Link to redmine ticket: https://redmine.openinfosecfoundation.org/issues/3910

Previous PR: https://github.com/OISF/suricata/pull/11105

Changes since v5:

• doc suggestion taken into account
• reorganize commits better so it requires less changes while still making sense logically
• rebased
• minor cleanups whitespaces et al.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 43.66197% with 40 lines in your changes are missing coverage. Please review.

Project coverage is 84.27%. Comparing base (b3eb1c4) to head (4d10ff9).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11124      +/-   ##
==========================================
+ Coverage   84.26%   84.27%   +0.01%     
==========================================
  Files         926      926              
  Lines      247387   247444      +57     
==========================================
+ Hits       208453   208540      +87     
+ Misses      38934    38904      -30     

Flag	Coverage Δ
fuzzcorpus	64.17% <42.25%> (-0.02%)	:arrow_down:
livemode	19.57% <22.53%> (-0.01%)	:arrow_down:
pcap	46.48% <18.30%> (+0.01%)	:arrow_up:
suricata-verify	63.12% <43.66%> (+0.01%)	:arrow_up:
unittests	61.94% <0.00%> (-0.02%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

[ct0br0]

qa tokens ran out. ignore the 'pipeline canceled' incoming

[suricata-qa]

Information: QA ran without warnings.

Pipeline 20779