Rename checkHomographyIsValid to findPrerecordTableLayout

src/schema.gql

@@ -669,7 +669,7 @@ type Mutation {
   editUser(input: EditUserInputGQL!): UserGQL!
   followUser(followedUserId: Int!): UserGQL!
   unfollowUser(followedUserId: Int!): UserGQL!
-  checkHomographyIsValid(b64Image: String!, videoId: Int!): HomographyInfoGQL
+  findPrerecordTableLayout(b64Image: Base64!, videoId: Int!): HomographyInfoGQL
   createUploadStream(
     videoMetadata: VideoMetadataInput!
   ): CreateUploadStreamReturn!
@@ -760,6 +760,14 @@ input EditUserInputGQL {
   fargoRating: Int = null
 }
 
+"""
+Represents binary data as Base64-encoded strings, using the standard alphabet.
+"""
+scalar Base64
+  @specifiedBy(
+    url: "https://datatracker.ietf.org/doc/html/rfc4648.html#section-4"
+  )
+
 type CreateUploadStreamReturn {
   videoId: Int!
 }