Added setDistributionChannel action for Carts and OrderEdits

You can now use a new action setLineItemDistributionChannel on OrderEdit, Cart and My Cart to change the Distribution Channel.

• [API] Added the SetLineItemDistributionChannel action for order edits
• [API] Added the SetLineItemDistributionChannel action for carts
• [API] Added the SetLineItemDistributionChannel action for my carts
• [GraphQL API] Added the following types to the GraphQL schema: SetCartLineItemDistributionChannel, SetStagedOrderLineItemDistributionChannel, SetStagedOrderLineItemDistributionChannelOutput.
• [GraphQL API] Changed the CartUpdateAction type:
  • Input field setLineItemDistributionChannel was added to CartUpdateAction type
• [GraphQL API] Changed the StagedOrderUpdateAction type:
  • Input field setLineItemDistributionChannel was added to StagedOrderUpdateAction type
• [GraphQL API] Changed the MyCartUpdateAction type:
  • Input field setLineItemDistributionChannel was added to MyCartUpdateAction type

Introduced the following changes to the GraphQL schema (in SDL format):

extend input CartUpdateAction {
  setLineItemDistributionChannel: SetCartLineItemDistributionChannel
}

extend input StagedOrderUpdateAction {
  setLineItemDistributionChannel: SetStagedOrderLineItemDistributionChannel
}

extend input MyCartUpdateAction {
  setLineItemDistributionChannel: SetCartLineItemDistributionChannel
}

input SetCartLineItemDistributionChannel {
  lineItemId: String!
  distributionChannel: ResourceIdentifierInput
}

input SetStagedOrderLineItemDistributionChannel {
  lineItemId: String!
  distributionChannel: ResourceIdentifierInput
}

type SetStagedOrderLineItemDistributionChannelOutput implements StagedOrderUpdateActionOutput {
  type: String!
  lineItemId: String!
  distributionChannelResId: ChannelReferenceIdentifier
}