DevSpaces Gateway plugin minimal impl

[azatsarynnyy]

https://issues.redhat.com/browse/CRW-5693

PR converts the IntelliJ IDEA plugin that was generated from a template repository to a Gateway plugin.
Adds minimal implementation to show the plugin on the first page:

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1 new problem were found

Inspection name	Severity	Problems
Incorrect string capitalization	🔶 Warning	1

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