Extract shared code of FilteredTrees to abstract base class

This moves the duplicate code of the E3.x and E4.x based FilteredTree
class and moves it into an AbstractFilteredViewerComposite class located
in the JFace component.

The base class is currently only implementing a tree-based filter, but
is structured in such a way that it can easily be extended to also
support e.g. table-based filters.

Due to being unused, the following fields and methods have been marked
as deprecated:
- filterToolBar
- clearButtonControl
- updateToolbar(boolean)

Contributes to
eclipse-platform#2567

bundles/org.eclipse.e4.ui.dialogs/META-INF/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.e4.ui.dialogs
-Bundle-Version: 1.5.0.qualifier
+Bundle-Version: 1.6.0.qualifier
 Bundle-RequiredExecutionEnvironment: JavaSE-17
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin