Switch to using an options object for all applicable APIs

[hossam-nasr]

Resolves #441. Switch from using concrete optional arguments to an options object where applicable.

I've broken this PR into small steps in commits to aid with PR review.

APIs changed in this PR (notice this list is slightly different than the one in the issue):

In DurableOrchestrationClient:

Before	After
```TS getStatus( instanceId: string, showHistory?: boolean, showHistoryOutput?: boolean, showInput?: boolean ): Promise ```	```TS getStatus( instanceId: string, options?: GetStatusOptions ): Promise ```
```TS getStatusBy( createdTimeFrom: Date | undefined, createdTimeTo: Date | undefined, runtimeStatus: OrchestrationRuntimeStatus[] ): Promise ```	```TS getStatusBy( options: SelectionOptions ): Promise ```
```TS purgeInstanceHistoryBy( createdTimeFrom: Date, createdTimeTo?: Date, runtimeStatus?: OrchestrationRuntimeStatus[] ): Promise ```	```TS purgeInstanceHistoryBy( options: SelectionOptions ): Promise ```
```TS raiseEvent( instanceId: string, eventName: string, eventData: unknown, taskHubName?: string, connectionName?: string ): Promise ```	```TS raiseEvent(options: RaiseEventOptions): Promise ```
```TS readEntityState( entityId: EntityId, taskHubName?: string, connectionName?: string ): Promise> ```	```TS readEntityState( entityId: EntityId, options?: TaskHubOptions ): Promise> ```
```TS rewind( instanceId: string, reason: string, taskHubName?: string, connectionName?: string ): Promise` ```	```TS rewind( instanceId: string, reason: string, options?: TaskHubOptions ): Promise ```
```TS signalEntity( entityId: EntityId, operationName?: string, operationContent?: unknown, taskHubName?: string, connectionName?: string ): Promise ```	```TS signalEntity( entityId: EntityId, options?: SignalEntityContext ): Promise ```
```TS waitForCompletionOrCreateCheckStatusResponse( request: HttpRequest, instanceId: string, timeoutInMilliseconds?: number, retryIntervalInMilliseconds?: number ): Promise; ```	```TS waitForCompletionOrCreateCheckStatusResponse( request: HttpRequest, instanceId: string, waitOptions?: WaitForCompletionOptions ): Promise; ```

In DurableOrchestrationContext:

Before	After
```TS callSubOrchestrator( name: string, input?: unknown, instanceId?: string ): Task ```	```TS // This is effectively equivalent // to the startNew() change callSubOrchestrator( name: string, options?: CallSubOrchestratorOptions ): Task ```
```TS callSubOrchestratorWithRetry( name: string, retryOptions: RetryOptions, input?: unknown, instanceId?: string ): Task ```	```TS callSubOrchestratorWithRetry( name: string, retryOptions: RetryOptions, options?: CallSubOrchestratorOptions ): Task ```