init: Build the cache for lookup

[amarzavery]

• Clone the azure-rest-api-specs repo at a specified location.
• Read all the swagger spec files and parse them
• Create an in memory cache for all the operations across all the swagger specs.
  The structure should look something like this

{
  "api-version1": [ {opeationObject(Sway)}, {operationObject(sway)}, . .  ],
  "api-version2": [ {opeationObject(Sway)}, {operationObject(sway)}, . . ]
  . . .
}

[vishrutshah]

Completed