Factor SyncApi options out of IStoredClientOptions (#3009)

There are a couple of callback interfaces which are currently stuffed into
`IStoredClientOpts` to make it easier to pass them into the `SyncApi`
constructor.

Before we add more fields to this, let's separate it out to a separate object.

spec/integ/matrix-client-methods.spec.ts

@@ -35,9 +35,7 @@ describe("MatrixClient", function () {
     let store: MemoryStore | undefined;
 
     const defaultClientOpts: IStoredClientOpts = {
-        canResetEntireTimeline: (roomId) => false,
         experimentalThreadSupport: false,
-        crypto: {} as unknown as IStoredClientOpts["crypto"],
     };
     const setupTests = (): [MatrixClient, HttpBackend, MemoryStore] => {
         const store = new MemoryStore();