Add diagrams for integration with Notifications plugin

docs/NotificationPluginIntegration.puml

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+@startuml
+
+package "Reporting Plugins" {
+  component [Reporting Dashboards] as rd
+  component [Reporting OpenSearch] as ros
+  component [Reporting Index] as ri
+  component [Reporting JobScheduler] as rjs
+  rd --> ros : CRUD operations on Report \n instances and Report Definitions
+  ros --> ri : Document Index operations
+  ros --> rjs : Initialize SPI
+  rjs --> ri : Listen for updates
+  rjs --> ros : executeJob callback
+}
+
+package "Notification Plugins" {
+  component [Notifications Dashboards] as nd
+  component [Notifications OpenSearch] as nos
+  component [Notifications SPI] as nspi
+  nd --> nos : CRUD operations on \n notification configurations
+  nos --> nspi : Send notification operations
+}
+
+ros -> nos : SendNotification Request
+rd --> nos : GetNotificationFeatureChannelList
+
+@enduml

docs/NotificationPluginInteraction.puml

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+@startuml
+
+actor "UI" as ui
+participant "Reporting Dashboards" as rd
+participant "Reporting OpenSearch" as ros
+participant "Reporting JobScheduler" as rjs
+participant "Notifications OpenSearch Plugin" as nos
+
+activate rjs
+
+group Schedule Report
+activate ui
+ui -> rd : Create/update Report Definitions UX info
+activate rd
+rd -> nos : GetNotificationFeatureChannelList
+activate nos
+nos --> rd : GetNotificationFeatureChannelList response
+deactivate nos
+rd --> ui : UX info with Available Channel list for reporting feature
+deactivate rd
+ui -> rd : save Report Definition
+activate rd
+rd -> ros : save Report Definition
+activate ros
+ros --> rd : Report Definition saved
+deactivate ros
+rd --> ui : Report Definition saved
+deactivate rd
+deactivate ui
+end
+
+group Job scheduler invokes executeJob
+rjs -> ros : executeJob
+activate ros
+ros -> ros : create Report Instance
+activate ros
+deactivate ros
+ros -> ros : create notification message
+activate ros
+deactivate ros
+ros -> nos : Send notification
+activate nos
+nos --> ros : Send notification response
+deactivate nos
+ros -> ros : Update report instance with status
+activate ros
+deactivate ros
+deactivate ros
+end
+
+group on-demand executeJob
+activate ui
+ui -> rd : Create on-demand Report
+activate rd
+rd -> ros : Create on-demand Report
+activate ros
+ros -> ros : create Report Instance
+activate ros
+deactivate ros
+ros -> ros : create notification message
+activate ros
+deactivate ros
+ros -> nos : Send notification
+activate nos
+nos --> ros : Send notification response
+deactivate nos
+ros -> ros : Update report instance with status
+activate ros
+deactivate ros
+ros --> rd : Create on-demand Report response
+deactivate ros
+rd --> ui : Create on-demand Report response
+deactivate
+deactivate ui
+end
+
+deactivate rjs
+
+@enduml