Remove bulk future-send request

as it is trickier to properly type / reuse code for, and is just an
alternative proposal in MSC4140 anyways

Author: AndrewFerr

src/@types/requests.ts

@@ -105,14 +105,6 @@ export type ISendFutureResponse<F extends ISendFutureRequestOpts> = F extends IS
     ? ISendTimeoutFutureResponse
     : ISendActionFutureResponse;
 
-export interface ISendFutureGroupResponse {
-    send_on_timeout: ITimeoutFutureTokens;
-    send_on_action?: {
-        [action_name: string]: IFutureTokens;
-    };
-    send_now?: ISendEventResponse;
-}
-
 interface IFuturePartialEvent {
     room_id: string;
     type: string;

src/client.ts

@@ -132,7 +132,6 @@ import {
     IRoomDirectoryOptions,
     ISearchOpts,
     ISendEventResponse,
-    ISendFutureGroupResponse,
     ISendFutureRequestOpts,
     ISendFutureResponse,
     IStatusResponse,
@@ -5364,43 +5363,6 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
         });
     }
 
-    /**
-     * Send a group of future events.
-     * TODO: type safety & threads...or remove altogether
-     *
-     * Note: This endpoint is unstable, and can throw an `Error`.
-     *   Check progress on [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140) for more details.
-     */
-    // eslint-disable-next-line
-    public async _unstable_sendFutureGroup(
-        roomId: string,
-        timeout: number,
-        sendOnTimeout: MatrixEvent,
-        sendOnAction?: Record<string, MatrixEvent>,
-        sendNow?: MatrixEvent,
-    ): Promise<ISendFutureGroupResponse> {
-        if (!(await this.doesServerSupportUnstableFeature(UNSTABLE_MSC4140_FUTURES))) {
-            throw Error("Server does not support the Futures API");
-        }
-
-        return await this.http.authedRequest<ISendFutureGroupResponse>(
-            Method.Put,
-            // NOTE: Difference from MSC = remove /send part of path, to avoid ambiguity with regular event sending
-            utils.encodeUri("/rooms/$roomId/future/$txnId", {
-                $roomId: roomId,
-                $txnId: this.makeTxnId(),
-            }),
-            undefined,
-            {
-                timeout,
-                send_on_timeout: sendOnTimeout,
-                ...(sendOnAction ?? { send_on_action: sendOnAction }),
-                ...(sendNow ?? { send_now: sendNow }),
-            },
-            { prefix: `${ClientPrefix.Unstable}/${UNSTABLE_MSC4140_FUTURES}` },
-        );
-    }
-
     /**
      * Get all pending futures for the calling user.
      *