Add dataset bundle to update site

Author: fipro78

org.eclipse.nebula.widgets.nattable.dataset.test/META-INF/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: NatTable Dataset Utilities Tests
 Bundle-SymbolicName: org.eclipse.nebula.widgets.nattable.dataset.test
-Bundle-Version: 2.5.0.qualifier
+Bundle-Version: 2.6.0.qualifier
 Bundle-RequiredExecutionEnvironment: JavaSE-11
 Fragment-Host: org.eclipse.nebula.widgets.nattable.dataset
 Require-Bundle: junit-jupiter-api;bundle-version="5.10.0",

org.eclipse.nebula.widgets.nattable.updatesite/category.xml

@@ -30,6 +30,7 @@
    <feature id="org.eclipse.nebula.widgets.nattable.extension.poi.feature.source">
       <category name="nattable-extensions"/>
    </feature>
+   <bundle id="org.eclipse.nebula.widgets.nattable.dataset"/>
    <category-def name="nattable-core" label="NatTable Core">
       <description>
          The core NatTable functions.