[CORL 547] org-wide announcements (#2813)

* CRUD announcements

* only show announcement if not disabled

* make announcements dismissable

* add announcement mutations

* update announcement form logic

* style announcements on stream

* update snap

* localize strings

* close form if announcement is removed

* move announcement config below sitewide commenting config

* move date calculation inside useMemo

* move announcementconfig code to announcementconfigcontainer

* use coralContext for localStorage

* fix type of announcement createdAt

* move announcement form to modal

* remove payload pruning from configure route

* simplify announcement display logic

* make validation message full width

Co-authored-by: Kim Gardner <kgardnr@gmail.com>

src/core/server/graph/schema/schema.graphql

@@ -1215,6 +1215,37 @@ type NewCommentersConfiguration {
   approvedCommentsThreshold: Int!
 }
 
+"""
+Announcement is an organization-wide announcement displayed above the stream
+for a set duration
+"""
+type Announcement {
+  """
+  id is a canonical identifier for this Annoucnement, used to dismiss on front-end.
+  """
+  id: ID!
+
+  """
+  createdAt is the creation date.
+  """
+  createdAt: Time!
+
+  """
+  disableAt is the computed date at which announcement will be invalid.
+  """
+  disableAt: Time!
+
+  """
+  duration determines how long the announcement will be valid for.
+  """
+  duration: Int!
+
+  """
+  content is the content displayed for the announcement.
+  """
+  content: String!
+}
+
 """
 Settings stores the global settings for a given Tenant.
 """
@@ -1365,6 +1396,8 @@ type Settings {
   newCommenters is the configuration for how new commenters comments are treated.
   """
   newCommenters: NewCommentersConfiguration! @auth(roles: [ADMIN])
+
+  announcement: Announcement
 }
 
 ################################################################################
@@ -3353,6 +3386,44 @@ input RecentCommentHistoryConfigurationInput {
   triggerRejectionRate: Float
 }
 
+input CreateAnnouncementInput {
+  """
+  content of the announcement.
+  """
+  content: String!
+
+  duration: Int!
+  """
+  clientMutationId is required for Relay support.
+  """
+  clientMutationId: String!
+}
+
+input DeleteAnnouncementInput {
+  """
+  clientMutationId is required for Relay support.
+  """
+  clientMutationId: String!
+}
+
+type CreateAnnouncementPayload {
+  """
+  clientMutationId is required for Relay support.
+  """
+  clientMutationId: String!
+
+  settings: Settings!
+}
+
+type DeleteAnnouncementPayload {
+  """
+  clientMutationId is required for Relay support.
+  """
+  clientMutationId: String!
+
+  settings: Settings!
+}
+
 input SettingsCommunityGuidelinesInput {
   """
   enable set to true will show the guidelines above the message box.
@@ -5763,6 +5834,14 @@ type Mutation {
   disableFeatureFlag(
     input: DisableFeatureFlagInput!
   ): DisableFeatureFlagPayload! @auth(roles: [ADMIN])
+
+  createAnnouncement(
+    input: CreateAnnouncementInput!
+  ): CreateAnnouncementPayload! @auth(roles: [ADMIN])
+
+  deleteAnnouncement(
+    input: DeleteAnnouncementInput!
+  ): DeleteAnnouncementPayload! @auth(roles: [ADMIN])
 }
 
 ##################