Move m.room_key.withheld content to a spearate file

... so that we can reuse it in key bundles

data/event-schemas/schema/components/room_key_withheld_content.yaml

@@ -0,0 +1,45 @@
+type: object
+properties:
+  algorithm:
+    type: string
+    enum: ["m.megolm.v1.aes-sha2"]
+    description: |-
+      The encryption algorithm for the key that this event is about.
+  room_id:
+    type: string
+    description: |-
+      Required if `code` is not `m.no_olm`.  The room for the key that
+      this event is about.
+  session_id:
+    type: string
+    description: |-
+      Required if `code` is not `m.no_olm`.  The session ID of the key
+      that this event is about.
+  sender_key:
+    type: string
+    description: |-
+      The unpadded base64-encoded device curve25519 key of the event\'s
+      sender.
+  code:
+    type: string
+    enum:
+      - m.blacklisted
+      - m.unverified
+      - m.unauthorised
+      - m.unavailable
+      - m.no_olm
+    description: |-
+      A machine-readable code for why the key was not sent. Codes beginning
+      with `m.` are reserved for codes defined in the Matrix
+      specification. Custom codes must use the Java package naming
+      convention.
+  reason:
+    type: string
+    description: |-
+      A human-readable reason for why the key was not sent. The receiving
+      client should only use this string if it does not understand the
+      `code`.
+required:
+  - algorithm
+  - sender_key
+  - code

data/event-schemas/schema/m.room_key.withheld.yaml

@@ -36,51 +36,7 @@ description: |-
   room messages sent before it receives the message.
 properties:
   content:
-    properties:
-      algorithm:
-        type: string
-        enum: ["m.megolm.v1.aes-sha2"]
-        description: |-
-          The encryption algorithm for the key that this event is about.
-      room_id:
-        type: string
-        description: |-
-          Required if `code` is not `m.no_olm`.  The room for the key that
-          this event is about.
-      session_id:
-        type: string
-        description: |-
-          Required if `code` is not `m.no_olm`.  The session ID of the key
-          that this event is about.
-      sender_key:
-        type: string
-        description: |-
-          The unpadded base64-encoded device curve25519 key of the event\'s
-          sender.
-      code:
-        type: string
-        enum:
-          - m.blacklisted
-          - m.unverified
-          - m.unauthorised
-          - m.unavailable
-          - m.no_olm
-        description: |-
-          A machine-readable code for why the key was not sent. Codes beginning
-          with `m.` are reserved for codes defined in the Matrix
-          specification. Custom codes must use the Java package naming
-          convention.
-      reason:
-        type: string
-        description: |-
-          A human-readable reason for why the key was not sent. The receiving
-          client should only use this string if it does not understand the
-          `code`.
-    required:
-      - algorithm
-      - sender_key
-      - code
-    type: object
+    $ref: "components/room_key_withheld_content.yaml"
   type:
     enum:
       - m.room_key.withheld