mqtt: Improve handling of multiple PDU parsing

[jlucovsky]

Continuation of #10262

Issue: 6592

Link to redmine ticket: 6592

Describe changes:

• Parse PDU instead of entire stream

Updates:

• Ensure frame created with proper size

Provide values to any of the below to override the defaults.

To use a pull request use a branch name like pr/N where N is the
pull request number.

Alternatively, SV_BRANCH may also be a link to an
OISF/suricata-verify pull-request.

SV_REPO=
SV_BRANCH=pr/1609
SU_REPO=
SU_BRANCH=
LIBHTP_REPO=
LIBHTP_BRANCH=

[catenacyber]

Guess SV PR needs an update, see my remarks there

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c3b3c11) 82.28% compared to head (1e51d70) 82.31%.
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10279      +/-   ##
==========================================
+ Coverage   82.28%   82.31%   +0.03%     
==========================================
  Files         977      978       +1     
  Lines      271950   272031      +81     
==========================================
+ Hits       223784   223935     +151     
+ Misses      48166    48096      -70     

Flag	Coverage Δ
fuzzcorpus	63.47% <100.00%> (+0.07%)	⬆️
suricata-verify	61.49% <0.00%> (-0.03%)	⬇️
unittests	62.84% <0.00%> (+0.01%)	⬆️

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

[suricata-qa]

Information: QA ran without warnings.

Pipeline 17948

[jlucovsky]

Continued in #10305