feat: text to image impl (#6437)

fix CLOUD-18
fix CLOUD-28
fix CLOUD-29

packages/backend/server/src/schema.gql

@@ -37,6 +37,13 @@ type CopilotQuota {
   used: SafeInt!
 }
 
+input CreateChatMessageInput {
+  attachments: [String!]
+  content: String!
+  params: String
+  sessionId: String!
+}
+
 input CreateChatSessionInput {
   """An mark identifying which view to use to display the session"""
   action: String
@@ -167,6 +174,9 @@ type Mutation {
   """Create a subscription checkout link of stripe"""
   createCheckoutSession(input: CreateCheckoutSessionInput!): String!
 
+  """Create a chat message"""
+  createCopilotMessage(options: CreateChatMessageInput!): String!
+
   """Create a chat session"""
   createCopilotSession(options: CreateChatSessionInput!): String!