[Bug Report] Cannot invoke direct methods with payload in IotEdge devices.

# Context

- **OS, version, SKU and CPU architecture used:Windows 10 Desktop x64
- **Application's .NET Target Framework : .NET8.0-RC2
- **Device: Laptop
- **SDK version used: 2.0.0-preview007
- IoT Edge version: 1.4.23

## Description of the issue
Cannot invoke direct methods with payload in IotEdge devices.

## Code sample exhibiting the issue
```csharp
var serviceClient = new IotHubServiceClient("HostName=***");
string json =
"{\"schemaVersion\": \"1.0\",\"items\": [{\"id\": \"module\",\"filter\": {\"tail\": 3,\"since\": \"10m\"}}],\"encoding\": \"none\",\"contentType\": \"text\"}";
DirectMethodServiceRequest request = new("GetModuleLogs")
{
Payload = Encoding.UTF8.GetBytes(json)
};
var result = await serviceClient.DirectMethods.InvokeAsync("deviceId", "$edgeAgent", request);
```
## Console log of the issue
{"message":"Error parsing command payload because of error - Error converting value \"eyJzY2hlbWFWZXJzaW9uIjogIjEuMCIsIml0ZW1zIjogW3siaWQiOiAiaW90ZWRnZWdhdGV3YXkiLCJmaWx0ZXIiOiB7InRhaWwiOiAzLCJzaW5jZSI6ICIxMG0ifX1dLCJlbmNvZGluZyI6ICJub25lIiwiY29udGVudFR5cGUiOiAidGV4dCJ9\" to type 'Microsoft.Azure.Devices.Edge.Agent.Core.Requests.ModuleLogsRequest'. Path '', line 1, position 186."}

Start with the DirectMethodServiceRequest payload construction and the DirectMethods.InvokeAsync call shown in the report, then compare the sent payload with the IoT Edge console error. Reproduce the request against an IoT Edge device and trace how the SDK encodes the payload; done means a payload-bearing direct method is accepted and the reported conversion error no longer occurs.

Written by the indexing model from the issue text.