Better maven p2 DSL

[nedtwigg]

The p2 DSL for maven is quite verbose

<p2repos>
  <p2repo>https://download.eclipse.org/eclipse/updates/4.26/</p2repo>
</p2repos>
<installs>
  <install>org.eclipse.swt</install>
</installs>

It would be a lot better if we could just do

<p2repo>https://download.eclipse.org/eclipse/updates/4.26/</p2repo>
<install>org.eclipse.swt</install>

The code for the DSL as it exists is very simple

equo-ide/plugin-maven/src/main/java/dev/equo/ide/maven/AbstractP2Mojo.java

Lines 51 to 53 in c27b46c

	@Parameter private List<String> p2repos = new ArrayList<>();
	@Parameter private List<String> installs = new ArrayList<>();

If there's a way (even a complicated way) to move to the simpler DSL, that would be great!