Describe the bug
When doing batchGet and specifying attributes to return, ElectroDB does not send the ProjectionExpression parameter.

However, ElectroDB still returns only the attributes I specified, but DynamoDB sends more data to the client than necessary due to the missing ProjectionExpression param.

ElectroDB Version
3.4.3

ElectroDB Playground Link
https://electrodb.fun/?#code/PQKgBAsg9gJgpgGzARwK5wE4Es4GcA0YuccYGeqCALgUQBYCG5YA7llXWAGbZwB2MXGBDAAUKKwBbAA5QMVMAG8wAUT5V2AT0IBlTADcsAY1IBfbhiiSwAIkRwjVSzABGNgNzijUPrgVUGFwRSAF5bTShUDAB9AKC4aL4GSTgPcVAwABUGXABrITUNKk1hMW9ffxz8sDC+OBZVdS0AClEwJTb2sElYRAAuDq6u-iLNAZsAvNwbfE6h-UxcLB9xgEYZua7iDEMTccnchmlpG03TWaGGKicsF1QqPAHFTfasGCewYuk4AYByP2wfAA5r9COQ0FhyO9Phh0GBTGcLl0sAI4AAPR6DIZgaSWABWDhoTxeXWkuWJ2OxXBwCGhNjJG0pQ28MigSweAwA2jY3jYALok9rnQVEclYpncGl0vKMiVgFmydk-MCcgUShGUjVdLXC9rKOLBeGiACUnlEB1wADogXAqM1Oco3n83r94XzjdaoM1nu0rjc7g9cFzfi6BaZjUA

Entity/Service Definitions
Include your entity model (or a model that sufficiently recreates your issue) to help troubleshoot.

const tasks = new Entity(
  {
    model: {
      entity: "tasks",
      version: "1",
      service: "taskapp"
    },
    attributes: {
      id: { type: 'string', required: true }
    },
    indexes: {
      projects: {
        pk: {
          field: "pk",
          composite: ["id"]
        },
        sk: {
          field: "sk",
          composite: []
        }
      }
    }
  },
  { table }
);

Expected behavior
When doing batchGet and specifying attributes to return, ElectroDB should create the ProjectionExpression parameter to prevent sending unnecessary data from DynamoDB to the client.