Provide improved plugin descriptor suitable for IDE integration

Currently m2e is leveraging the standard plugin descriptor to extract information like description per plugin parameter (https://github.com/eclipse/lemminx-maven/blob/2c7540b79254c36f935f1d62fe218c43139595c4/lemminx-maven/src/main/java/org/eclipse/lemminx/extensions/maven/utils/MavenPluginUtils.java#L144) for exposing plugin parameter information on hover in the pom.xml editor.

The standard plugin descriptor contains parameter descriptions in plain text only format (compare with https://issues.apache.org/jira/browse/MPLUGIN-417). In order to be able to generate proper links to other plugin parameters or javadoc it is crucial to emit an enhanced version of that information.