[ADLS Gen2] Swagger + generated code

[mahmoudbahaa]

As per https://github.com/Azure/Azurite/wiki/ADLS-Gen2-Implementation-Guidance

First PR:

PR to add DFS swagger and the auto-generated API interface (no manual change on auto generated code)

Swagger source:

https://github.com/Azure/azure-rest-api-specs/blob/main/specification/storage/data-plane/Azure.Storage.Files.DataLake/stable/2023-05-03/DataLakeStorage.json

Note: Remaining of generated server code (middleware, request and response.) is copied from blob endpoint as it wasn't generated