http: prepare libhtp-rs

[catenacyber]

Link to ticket: https://redmine.openinfosecfoundation.org/issues/
https://redmine.openinfosecfoundation.org/issues/2696

Describe changes:

• prepare libhtp-rs by defining aliases for the new values used by libhtp-rs

This allow to go one small step further

The big libhtp-rs commit will remove app-layer-htp-libhtp.h which defines these aliases

#12400 will need ro be rebased after this (with a smaller commit message and diff)

I will do a next PR like that for opaque accessors as well

[codecov]

Codecov Report

Attention: Patch coverage is 85.77982% with 31 lines in your changes missing coverage. Please review.

Project coverage is 80.62%. Comparing base (078c646) to head (4f4dcc0).
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12407      +/-   ##
==========================================
- Coverage   80.63%   80.62%   -0.02%     
==========================================
  Files         917      918       +1     
  Lines      258687   258717      +30     
==========================================
- Hits       208601   208594       -7     
- Misses      50086    50123      +37     

Flag	Coverage Δ
fuzzcorpus	56.81% <72.28%> (+<0.01%)	⬆️
livemode	19.40% <34.23%> (+<0.01%)	⬆️
pcap	44.25% <78.26%> (-0.01%)	⬇️
suricata-verify	63.23% <78.26%> (+<0.01%)	⬆️
unittests	58.51% <80.27%> (+<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 24231

[victorjulien]

Merged in #12413, thanks!