[e4] provide injection for IDialogSettingsProvider

[laeubi]

Currently the only way to obtain a IDialogSettingsProvider seem to be by calling org.eclipse.ui.PlatformUI.getDialogSettingsProvider(Bundle) but this is E3 API and require a running workbench.

This actually already calls into E4 land by using org.eclipse.e4.ui.internal.workbench.swt.DialogSettingsProviderService but that's all internal.

To make this usable outside E3 also in plain E4 RCP applications the following should be done:

1. Have an IDialogSettingsProviderService that has method IDialogSettingsProviderService#getDialogSettingsProvider and is published in the OSGi-Service Factory, this then would also allow to handel all the currently static parts with proper OSGi-DS injections, e.g currently tracked bundles and the event listeners are never cleaned up!
2. Allow to @Inject IDialogSettingsProvider provider into E4 Components by having a context function. Such context function should then be implemented as a ServiceFactory so it supply a proper object per bundle if used in an E4 component.