Add findFolder and findFolders queries to graphql schema (#5965)

* Add findFolder and findFolders queries to graphql schema
* Add zip file criterion to file and folder queries

graphql/schema/schema.graphql

@@ -16,6 +16,16 @@ type Query {
     ids: [ID!]
   ): FindFilesResultType!
 
+  "Find a file by its id or path"
+  findFolder(id: ID, path: String): Folder!
+
+  "Queries for Files"
+  findFolders(
+    folder_filter: FolderFilterType
+    filter: FindFilterType
+    ids: [ID!]
+  ): FindFoldersResultType!
+
   "Find a scene by ID or Checksum"
   findScene(id: ID, checksum: String): Scene
   findSceneByHash(input: SceneHashInput!): Scene

graphql/schema/types/file.graphql

@@ -10,7 +10,7 @@ type Folder {
   parent_folder_id: ID @deprecated(reason: "Use parent_folder instead")
   zip_file_id: ID @deprecated(reason: "Use zip_file instead")
 
-  parent_folder: Folder!
+  parent_folder: Folder
   zip_file: BasicFile
 
   mod_time: Time!
@@ -176,3 +176,8 @@ type FindFilesResultType {
 
   files: [BaseFile!]!
 }
+
+type FindFoldersResultType {
+  count: Int!
+  folders: [Folder!]!
+}

graphql/schema/types/filters.graphql

@@ -691,6 +691,7 @@ input FileFilterType {
   dir: StringCriterionInput
 
   parent_folder: HierarchicalMultiCriterionInput
+  zip_file: MultiCriterionInput
 
   "Filter by modification time"
   mod_time: TimestampCriterionInput
@@ -721,6 +722,32 @@ input FileFilterType {
   updated_at: TimestampCriterionInput
 }
 
+input FolderFilterType {
+  AND: FolderFilterType
+  OR: FolderFilterType
+  NOT: FolderFilterType
+
+  path: StringCriterionInput
+
+  parent_folder: HierarchicalMultiCriterionInput
+  zip_file: MultiCriterionInput
+
+  "Filter by modification time"
+  mod_time: TimestampCriterionInput
+
+  gallery_count: IntCriterionInput
+
+  "Filter by files that meet this criteria"
+  files_filter: FileFilterType
+  "Filter by related galleries that meet this criteria"
+  galleries_filter: GalleryFilterType
+
+  "Filter by creation time"
+  created_at: TimestampCriterionInput
+  "Filter by last update time"
+  updated_at: TimestampCriterionInput
+}
+
 input VideoFileFilterInput {
   resolution: ResolutionCriterionInput
   orientation: OrientationCriterionInput