transform: luaxform transform script

[jlucovsky]

Continuation of #12136

Add the luaxform transform that uses a Lua script to receive and transform a sticky buffer.

Lua transforms receive arguments

• (always): length of input buffer and input buffer
• (always): number of additional arguments (may be 0)
• (when present): argument array (bounded by argument count)

Arguments are passed to the Lua script as they appear in the rule:

 luaxform:./lua/lua-transform.lua, bytes 4, offset 13, hash sha256;

When the transform is invoked, 3 additional arguments are passed (arg count will be 3)

• bytes 4
• offset 13
• hash sha256

The Lua script is responsible for parsing and using the arguments and returning a tuple: output-buffer, output-buffer-byte-count

I used this Lua script:

function init (args)
  -- Optional, no return value
end

function transform(input_len, input, argc, args)
    SCLogNotice("Input length: " .. input_len .. " arg-count: " .. argc)
    for i = 1, argc do
        print("Argument " .. i .. ":", args[i])
    end
    return string.upper(input), input_len
end

return 0

Example rule using the Lua script:

alert http any any -> any any (msg:"Lua Xform example"; flow:established;  file.data; luaxform:./lua/lua-transform.lua; content: "abc"; sid: 1;)

Link to ticket: https://redmine.openinfosecfoundation.org/issues/2290

Describe changes:

• Luaxform transform changes

Updates

• Address formatting issue

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

• To use an LibHTP, Suricata-Verify or Suricata-Update pull request,
  link to the pull request in the respective _BRANCH variable.
• Leave unused overrides blank or remove.

SV_REPO=
SV_BRANCH=OISF/suricata-verify#2090
SU_REPO=
SU_BRANCH=
LIBHTP_REPO=
LIBHTP_BRANCH=

[codecov]

Codecov Report

Attention: Patch coverage is 83.78378% with 72 lines in your changes missing coverage. Please review.

Project coverage is 49.81%. Comparing base (13841c0) to head (4eaffd9).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12141      +/-   ##
==========================================
+ Coverage   49.77%   49.81%   +0.03%     
==========================================
  Files         909      912       +3     
  Lines      257884   258098     +214     
==========================================
+ Hits       128367   128574     +207     
- Misses     129517   129524       +7     

Flag	Coverage Δ
fuzzcorpus	60.87% <46.52%> (-0.07%)	⬇️
livemode	19.44% <13.19%> (+<0.01%)	⬆️
pcap	44.15% <30.32%> (-0.25%)	⬇️
suricata-verify	62.71% <83.79%> (+0.02%)	⬆️
unittests	8.97% <0.00%> (-0.01%)	⬇️

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

---- 🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[suricata-qa]

ERROR:

ERROR: QA failed on SURI_TLPR1_alerts_cmp.

Pipeline 23484