Separate out SDKContext (#34053)

* Separate out SDKContext

...from SDKContextClass, as the comments hopefully explain.

Also make the captitalisation consistent.

* Adding the new file usually helps too

* Fix import

* More comment

* Update the various imports of SDKContextClass

* Also fix case of TestSDKContext

* Update the mock

apps/web/test/test-utils/room.ts

@@ -14,7 +14,7 @@ import { MainSplitContentType } from "../../src/contexts/RoomContext";
 import { type RoomContextType, TimelineRenderingType } from "../../src/contexts/RoomContext";
 import { Layout } from "../../src/settings/enums/Layout";
 import { mkEvent } from "./test-utils";
-import { SdkContextClass } from "../../src/contexts/SDKContext";
+import { SDKContextClass } from "../../src/contexts/SDKContextClass";
 
 export const makeMembershipEvent = (roomId: string, userId: string, membership = KnownMembership.Join) =>
     mkEvent({
@@ -45,7 +45,7 @@ export const makeRoomWithStateEvents = (
 
 export function getRoomContext(room: Room, override: Partial<RoomContextType>): RoomContextType {
     return {
-        roomViewStore: SdkContextClass.instance.roomViewStore,
+        roomViewStore: SDKContextClass.instance.roomViewStore,
         room,
         roomLoading: true,
         peekLoading: false,