[FEATURE REQ] Add DataLakeAnalyticsScope to Data Factory Activity List

### API Spec link

https://github.com/Azure/azure-rest-api-specs/blob/e3d0a3944bc6c87764a8268737bf91827390bb03/specification/datafactory/resource-manager/Microsoft.DataFactory/DataFactory/stable/2018-06-01/entityTypes/Pipeline.json#L7797

### API Spec version

2018-06-01

### Please describe the feature.

Under `specification/datafactory/resource-manager/Microsoft.DataFactory/DataFactory/stable/2018-06-01/entityTypes
/Pipeline.json` there an activity type called **DataLakeAnalyticsUSQLActivity** which is related to **U-SQL** activity at Data Factory Activities list. The Activity is shown in the bellow screen shot of Data Factory Editor


The issue is that the **Scope** Activity is missing, and Scope Activity is necessary for data transformation from ADLA to ADLA which is my use case. According to exported ARM template the missing type is **DataLakeAnalyticsScope**.

I need that type for arm template so it can be used by EV2 compiler.

Start with specification/datafactory/resource-manager/Microsoft.DataFactory/DataFactory/stable/2018-06-01/entityTypes/Pipeline.json around line 7797 and compare the existing DataLakeAnalyticsUSQLActivity definition with the exported ARM template referenced in the issue. Done means the DataLakeAnalyticsScope activity type is represented in the specification so it can be used by the EV2 compiler.

Written by the indexing model from the issue text.