libnginx-mod-http-lua in a separate package

Since nginx 1.22.0-2, any module can be built separately. (Credit to @shankerwangmiao, he made nginx-dev package).

As the first libnginx-mod-http-lua module that has the most problems:

• luajit vs luajit2
• broken luajit2 on e.g. ppc64el platform
• lua module is not compatible with PCRE2
• etc ....

This issue is created to document the actions that need to be done. And for information flow.

Steps:

• create salsa project /nginx-team/libnginx-mod-http-lua
• prepare new ngx-lua packages including autopkgtests
• create ITP bug
• upload ngx-lua to NEW queue (it may take a long time)
• remove http-lua from nginx

Links:

• nginx changes are prepaired in experimental branch https://salsa.debian.org/nginx-team/nginx/-/tree/experimental
• ngx-lua are prepaired here: https://salsa.debian.org/janmojzis/ngx-lua/

Info: @teward @onovy @kartik @ctrochalakis @kapouer @shankerwangmiao