Disable Facet with annotation (#86)

Hello everyone,

with this patch I suggest adding the annotation
`@changelog.disable_facet` to disable the facet on an entity completely.
This might be useful if we have deep fiori UIs where a lot of the
entities are tracked. Depending on the configuration, I want all of them
tracked on the main entity, yet empty facets are shown on the subpages
anyway.

Have a nice weekend and feel free to ask questions.

Kind regards

---------

Co-authored-by: Nick Josipovic <[email protected]>

Author: pandayo

README.md

@@ -227,6 +227,10 @@ annotate sap.changelog.aspect @(UI.Facets: [{
 
 The system now uses the SAPUI5 default setting `![@UI.PartOfPreview]: true`, such that the table will always shown when navigating to that respective Object page.
 
+### Disable Facet
+
+To not show the changelog facet on compositions subsites, you can use `@changelog.disable_facet` for the facet to not show up.
+
 
 ## Modelling Samples
 

cds-plugin.js

@@ -58,7 +58,8 @@ cds.on('loaded', m => {
       }
 
       // Add UI.Facet for Change History List
-      entity['@UI.Facets']?.push(facet)
+      if(!entity['@changelog.disable_facet'])
+        entity['@UI.Facets']?.push(facet)
 
       // The changehistory list should be refreshed after the custom action is triggered
       if (entity.actions) {