Remove backbone as a dependency

Co-authored-by: Yash <yash@signal.org>
Co-authored-by: ayumi-signal <143036029+ayumi-signal@users.noreply.github.com>
Co-authored-by: Jamie Kyle <113370520+jamiebuilds-signal@users.noreply.github.com>
Co-authored-by: Fedor Indutny <79877362+indutny-signal@users.noreply.github.com>
Co-authored-by: trevor-signal <131492920+trevor-signal@users.noreply.github.com>

patches/@types+backbone+1.4.22.patch

@@ -1,49 +0,0 @@
-diff --git a/index.d.ts b/index.d.ts
-index 15d9d4b..a431841 100644
---- a/index.d.ts
-+++ b/index.d.ts
-@@ -66,7 +66,7 @@ declare namespace Backbone {
-         collection?: Collection<TModel> | undefined;
-     }
- 
--    type CombinedModelConstructorOptions<E, M extends Model<any, any, E> = Model> = ModelConstructorOptions<M> & E;
-+    type CombinedModelConstructorOptions<E, M extends Model<any, any, E> = Model<any, any, E>> = ModelConstructorOptions<M> & E;
- 
-     interface ModelSetOptions extends Silenceable, Validable {}
- 
-@@ -204,7 +204,7 @@ declare namespace Backbone {
-          */
-         static extend(properties: any, classProperties?: any): any;
- 
--        attributes: Partial<T>;
-+        attributes: T;
-         changed: Partial<T>;
-         cidPrefix: string;
-         cid: string;
-@@ -220,7 +220,7 @@ declare namespace Backbone {
-          * That works only if you set it in the constructor or the initialize method.
-          */
-         defaults(): Partial<T>;
--        id: string | number;
-+        id: string;
-         idAttribute: string;
-         validationError: any;
- 
-@@ -251,7 +251,7 @@ declare namespace Backbone {
-          *    return super.get("name");
-          * }
-          */
--        get<A extends _StringKey<T>>(attributeName: A): T[A] | undefined;
-+        get<A extends _StringKey<T>>(attributeName: A): T[A];
- 
-         /**
-          * For strongly-typed assignment of attributes, use the `set` method only privately in public setter properties.
-@@ -285,7 +285,7 @@ declare namespace Backbone {
-         previousAttributes(): Partial<T>;
-         save(attributes?: Partial<T> | null, options?: ModelSaveOptions): JQueryXHR;
-         unset(attribute: _StringKey<T>, options?: Silenceable): this;
--        validate(attributes: Partial<T>, options?: any): any;
-+        validate(attributes: T, options?: any): any;
-         private _validate(attributes: Partial<T>, options: any): boolean;
- 
-         // mixins from underscore