Add input fields for Maven coordinates in UI

[geziefer]

The current version of the starter generates default Maven coordinates:

	<groupId>org.eclipse</groupId>
	<artifactId>jakartaee-hello-world</artifactId>
	<version>0.1-SNAPSHOT</version>

As it is common in other starters (e.g. SpringBoot, MicroProfile, Quarkus, OpenLiberty, ...) we should allow for editing those values in UI before project creation.

[geziefer]

I will reduce the Maven coordinates to groupId and artifactId, since version is not likely to change and other starters, like MicroProfile or OpenLiberty does not ask for it as well.
And Group and Artifact are not only important as maven coordinates, but also for generating the Java packages.

[m-reza-rahman]

Great. I suspect the fewer the better.

[geziefer]

The feature was implemented as follows:
groupid and artifactid were added in ui as text input fields. They are both in one line to save space.
There is validation involved, making sure that they are not empty and contain only valid values. Group was validated for Java package naming and Artifact for Java jar naming (somewhat more strict than really possible, but I'd say reasonable).
The archetype was left untouched, but fed with the new parameters groupId, artifactId and package.
For generation, the mechanism as it was was also kept by creating the java package according to the groupId plus the fixed jakarta.hello for the sample code.
The name in pom and for the jar file was kept - here we could discuss if it should be named after artifactId, but in that case we have to adapt the archetype.
Concerning caching, it seemed to be reasonable to only cache when the default values for groupId and artifactId were used as otherwise it is highly unlikely that we profit from it and would only fill up the cache unnecessarily.
Additionally, a few log statements were deleted which seem more for debugging while implementing ui selection.