Invoice, order, product, and rate card feature update

[ghost]

Description

Through this pull request the following changes are being made

• Invoices
  • Changed the the following types of the AzureDataMarketLineItem class from int to double
  • ConsumptionDiscount
  • ConsumptionPrice
  • IncludedQuantity
  • ListPrice
  • OverageQuantity
  • PostTaxEffectiveRate
  • PostTaxTotal
  • PretaxEffectiveRate
  • PretaxCharges
  • TaxAmount
  • Changed the following type of the BaseAzureDataMarketLineItem class from int to double ConsumedQuantity
• Orders
  • Added the ability to include pricing details in the order information returned when requesting a list of customer orders
• Products
  • Removed the SKU download operations
• Rate Card
  • Changed the following type of the AzureMeter class from int to double IncludedQuantity