Add example extension to egress data to Azure

[kelltrick]

Adds code to accept data from extension interface and egress to Azure.

[kelltrick]

Here is the setup I've been testing with:

1. Compile dotnet-monitor.sln
2. Copy [dotnet-monitor]\artifacts\bin\AzureBlobStorage\Debug\net6.0 to [dotnet-monitor]\artifacts\bin\dotnet-monitor\Debug\net6.0\extensions\azure-storage
3. Install these settings:

{
    "$schema": "https://aka.ms/dotnet-monitor-schema",

    "DiagnosticPort": {
        "ConnectionMode": "Listen",
        "EndpointName": "dotnetmonitorpipe"
    },

    "DefaultProcess": {
        "Filters": [
            {
                "ProcessName": "AllocationTestApp"
            }
        ]
    },
    "Egress": {
        "AzureBlobStorage": {
            "monitorBlob": {
                "AccountKeyName": "AzAccountKey",
                "AccountUri": "https://pafenelodnmegress.blob.core.windows.net",
                "ContainerName": "dotnet-monitor",
                "BlobPrefix": "artifact"
            }
        },
        "FileSystem": {
            "localFile": {
                "DirectoryPath": "C:\\scratch"
            }
        },
        "Properties": {
            "AzAccountKey": "=====[REDACTED, this should be an Az Storage base 64 encoded key]======"
        },
        "azure-storage": {
            "azureTest": {
                "AccountKeyName": "AzAccountKey",
                "AccountUri": "https://pafenelodnmegress.blob.core.windows.net",
                "ContainerName": "dotnet-monitor",
                "BlobPrefix": "artifact"
            },
            "azure2Test": {
                "AccountKeyName": "AzAccountKey",
                "AccountUri": "https://companyblob.blob.core.windows.net",
                "ContainerName": "debugme",
                "BlobPrefix": "artifact"
            }
        },
        "AWS_S3": {
            "myBucketsEgress": {
                "AccountID": "sdfsdfhsldkf",
                "AccountKey": "foihj2930j0239r3322"
            }
        },
        "External": {
            "extTest": {}
        },
        "MyCustomProvider": {
            "custom": {}
        }
    }
}

4. Launch a target debuggee app called AllocationTestApp.exe
5. Launch dotnet-monitor collect --metrics false
6. Call the http api https://localhost:56019/dump?type=WithHeap&egressProvider=azureTest
   [Observe dump getting egressed via external extension]

[wiktork]

Left some feedback, but looks good otherwise.

[kelltrick]

Todos after this PR gets done:

1. @wiktork 's comment about when the Standard In stream gets assigned.

This is registered before StdInStream is assigned. Consider setting up the stream things upfront and then calling egress. This also removes the need for the GetStream function, which really should not be called from anywhere else.

2. Double check that Console.ReadLine() will fully consume the \r\n Windows newline on a linux build. I want to make sure this isn't something special on WSL.