Lua http2 6409 v2

[catenacyber]

Link to ticket: https://redmine.openinfosecfoundation.org/issues/6409

Describe changes:

• lua : begin support for HTTP2

SV_BRANCH=OISF/suricata-verify#3315

DRAFT :
Does the syntax look good so far ?
If it is ok, I can complete the commits to support all lua functions for HTTP2

[catenacyber]

Medium — src/util-lua-http.c:64,90,124: get_tx() and get_h2_tx() reject ALPROTO_DOH2, although HTTP/2 signature engines intentionally inspect the outer HTTP/2 transaction on DoH2 flows. Lua rules therefore miss DoH2 URI matches or abort on a nil transaction. Treat DoH2 as HTTP/2 in both getter checks and URI dispatch, and add DoH2 coverage to suricata-verify PR #3315, whose capture contains only HTTP/1 and plain HTTP/2.

To fix, but I guess I will wait on the syntax validation first

[codecov]

Codecov Report

❌ Patch coverage is 60.65574% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.04%. Comparing base (7c66954) to head (14a26df).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16104      +/-   ##
==========================================
- Coverage   83.06%   83.04%   -0.02%     
==========================================
  Files        1004     1004              
  Lines      277376   277434      +58     
==========================================
- Hits       230389   230382       -7     
- Misses      46987    47052      +65     

Flag	Coverage Δ
fuzzcorpus	61.48% <8.19%> (-0.02%)	⬇️
livemode	18.44% <8.19%> (+0.02%)	⬆️
netns	22.84% <8.19%> (-0.04%)	⬇️
pcap	45.40% <8.19%> (-0.02%)	⬇️
suricata-verify	67.12% <60.65%> (-0.04%)	⬇️
unittests	58.51% <13.11%> (-0.02%)	⬇️

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[suricata-qa]

Information: QA ran without warnings.

Pipeline = 33323