Consider how Eclipse Marketplace entry might be used to make Liberty Tools Eclipse more discoverable

[scottkurz]

A quick search seems to show that the Eclipse Marketplace might use a special "tag" convention, e.g fileExtension_xml registers a feature as supporting .xml files.

E.g. it looks like the core platform entry:
https://marketplace.eclipse.org/content/eclipse-enterprise-java-and-web-developer-tools
has a bunch of these tags. (I haven't confirmed BTW in "doc" that this is indeed the purpose of this tag "convention").

So while it'd seem like something to investigate one can also quickly realize we don't "own" a particular extension (like .xml ) We have server.xml...could we associate with the whole filename and not just the "extension"? Not sure.. we'd have to investigate if Eclipse Marketplace helps us any here.

[scottkurz]

We should also register with the nature for users opening projects w/o yet having installed Liberty Tools.

[awisniew90]

We should be able to add a our liberty nature in a tag like this:
nature_io.openliberty.tools.eclipse.ui.libertyNature, but that function is busted in the new Eclipse Marketplace interface. I reached out to Eclipse and they opened an issue to track the regression:

https://gitlab.eclipse.org/eclipsefdn/it/websites/marketplace.eclipse.org/-/issues/221