Issue #3382078: When watch for content is selected

Closes #3382078

config/schema/paragraphs_report.schema.yml

+paragraphs_report.settings:
+  type: config_object
+  mapping:
+    content_types:
+      type: sequence
+      orderby: key
+      label: "Content types to report on"
+    hide_paras:
+      type: sequence
+      orderby: key
+      label: "Paragraph types to hide from report"
+    import_rows_per_batch:
+      type: integer
+      label: "Number of entities per batch"
+    watch_content:
+      type: boolean
+      label: "Watch for content changes and update report data"