Output alert applayer v6

[catenacyber]

Link to redmine ticket:
None, preliminary work for https://redmine.openinfosecfoundation.org/issues/5053 and app-layer plugins
Continuation of #8772
https://redmine.openinfosecfoundation.org/issues/5977

Describe changes:

• Fix setup-app-layer script so that it adds app-layer metadata to alerts
• Adds ftp metadata to alerts
• Adds tftp metadata to alerts
• Adds krb5 metadata to alerts
• Removes tx_id from ssh and http2 logging

Continues #8922 with review taken into account

SV_BRANCH=pr/1196

OISF/suricata-verify#1196

Still to do :
Any ideas about the commit segmentation ? and PR splitting ?
I guess I should make a first smaller version with uncontroversial changes

[codecov]

Codecov Report

Merging #8961 (f6cb529) into master (6154bab) will decrease coverage by 0.01%.
The diff coverage is 97.02%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8961      +/-   ##
==========================================
- Coverage   82.42%   82.41%   -0.01%     
==========================================
  Files         969      957      -12     
  Lines      273476   272917     -559     
==========================================
- Hits       225410   224934     -476     
+ Misses      48066    47983      -83     

Flag	Coverage Δ
fuzzcorpus	65.02% <84.52%> (+0.08%)	⬆️
suricata-verify	60.42% <97.02%> (-0.09%)	⬇️
unittests	63.04% <24.40%> (+0.12%)	⬆️

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

[suricata-qa]

Information:

field	baseline	test	%
	TREX_GENERIC_stats_chk
.capture.kernel_drops	0	172	0.00

Pipeline 14239

[catenacyber]

Waiting for #8977 merge before rebasing

[catenacyber]

Keeping it open because there is more here than in #9005

[suricata-qa]

Information:

field	baseline	test	%
	TREX_GENERIC_stats_chk
.capture.kernel_drops	0	172	0.00

Pipeline 14239

[catenacyber]

Closing for now
#9252 has a part of this, and more will be reused from this