Initial implementation of %jp_binding macro

[mizdebsk]

Add new experimental %jp_binding macro for generating binding packages, which are typically used to configure Java applications such as Maven to run with particular JVM implementation, but the mechanism is generic and can be used for other things as well.

Unlike earlier implementations of binding packages, the new approach does not lead to creating conflicting packages. Instead a hierarchy of symlinks is maintained, similarly to the alternatives system.

Currently there is no way to specify which binding will be selected in case when there is more than one installed (there is nothing like priorities yet), but this subject to change in the future.

The implementation of %jp_binding relies on "dynamic spec generation" (aka "specparts") feature of RPM 4.19, but later it could be updated to work with older RPM versions too. More info in RPM docs: https://rpm-software-management.github.io/rpm/manual/dynamic_specs.html

Example usage:

%install
mkdir -p %{buildroot}/etc
echo JAVA_HOME=/opt/jvm/java-17-somejdk >%{buildroot}/etc/marvin-somejdk17.conf
echo JAVA_HOME=/opt/jvm/java-21-somejdk >%{buildroot}/etc/marvin-somejdk21.conf
touch %{buildroot}/etc/marvin-unbound.conf
ln -s %{_jpbindingdir}/marvin.conf %{buildroot}/etc/marvin.conf

%jp_binding --provides marvin-jdk-binding \
            --base-pkg marvin \
 	    --variant unbound \
 	    --ghost marvin.conf \
 	    --target /etc/marvin-unbound.conf

# bindings can be also added in a loop
for jdk in 17 21; do
  %jp_binding --provides marvin-jdk-binding \
              --base-pkg marvin \
	      --variant somejdk${jdk} \
	      --ghost marvin.conf \
	      --target /etc/marvin-somejdk${jdk}.conf \
	      --requires somejdk-${jdk}-headless \
	      --recommends somejdk-${jdk}-devel
done

%files
%config /etc/marvin*.conf

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.00%. Comparing base (3471e50) to head (e1afdcc).
Report is 26 commits behind head on master.

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@@           Coverage Diff           @@
##           master     #140   +/-   ##
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  Coverage   91.00%   91.00%           
=======================================
  Files          45       45           
  Lines        3401     3401           
=======================================
  Hits         3095     3095           
  Misses        306      306           

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