Customize build for Liberty Tools for IntelliJ

[cherylking]

Investigate whether we can/should provide a jar for Liberty Tools for IntelliJ to consume that includes the Eclipse LemMinX dependency. Currently, the dependency is configured with <scope>provided</scope> in the pom.xml in LCLS, which causes it to not be included in the ...-jar-with-dependencies.jar artifact. This is the desired behavior for both Liberty Tools for Eclipse (which includes Eclipse LemMinX within the Eclipse IDE) and Liberty Tools for Visual Studio Code (which includes Eclipse LemMinX as part of the XML Language Support by Red Hat extension.

Liberty Tools for IntelliJ currently has a direct dependency in its build.gradle for Eclipse LemMinX and this needs to be kept in sync with whichever version of LCLS it is pulling in. That dependency could be removed if Eclipse LemMinX was included in the LCLS artifact.

There are two jar files produced by the LCLS lemminx-liberty build today:

1. liberty-langserver-lemminx-<version>.jar
2. liberty-langserver-lemminx-<version>-jar-with-dependencies.jar

If we decide to fix this issue, we would add a third jar: liberty-langserver-lemminx-<version>-jar-with-all-dependencies.jar