added "AdditionalHeaders" parameter to Invoke-DCMSGraphQuery

[PaulHCode]

My auto-formatter formatted the file differently, sorry about that.

You can also see that I modified Invoke-DCMSGraphQuery to include a new parameter "AdditionalHeaders". This will allow folks to add additional headers like "ConsistencyLevel" and setting it to "eventual" so that we can perform search in a resource graph query as shown in the example I added.

Invoke-DCMsGraphQuery -AccessToken $AccessToken -GraphMethod 'GET' -GraphUri 'https://graph.microsoft.com/v1.0/users/?$count=true&search="displayName:-admin"' -AdditionalHeaders @{'ConsistencyLevel' = 'eventual' }

Since those responses have a nextLink instead of .@odata.nextLink I also added handling for that with these additional lines:

While ($QueryRequest.nextLink) {
$QueryRequest = Invoke-RestMethod -Headers $HeaderParams -Uri $QueryRequest.'nextLink' -UseBasicParsing -Method $GraphMethod -ContentType "application/json"
$QueryResult += $QueryRequest.value
}

I've been using it and it has worked great for me.