Usability improvements for pom.xml editing

[hrishin]

Following could be improvements for che in java application context

1. Editing pom.xml
   • Tab space is not working, most of devs. are used to for tab space. (not sure if its an issue)
   • Adding new dependency
     To add dependency developer goes to google, maven central -> search the dependency by
     group/artifact id -> copy the snippet
     Instead of that how nice it would be to have "search" option in che editor only for pom.xml wherein
     the developer can search the dependency by "group id, artifact id or possibly by keyword match for
     both, select the dependency and get it add to pom.xml

[l0rd]

cc @ashumilova @vparfonov

[ibuziuk]

@hrishin I believe this is a pure upstream issue. Could you please open relevant issues against https://github.com/eclipse/che so that it would be tracked upstream ?

[gorkem]

@fbricon another request for the pom.xml LSP