Support for `addPassword`

[srusun]

Feature Request:
Would like a way to create a client secret for an Azure app using the python

Problem:
To create the client secret, we go STRAIGHT TO HTTP!!
We were UNABLE to find an azure-sdk-for-python solution that supported this endpoint.
This seems like a bug or a design flaw!

Current Solution:

header = {
    "Content-Type": "application/json",
    "Authorization": "Bearer {}".format(graph_credentials.token["access_token"]),
}
url = "https://graph.microsoft.com/v1.0/servicePrincipals/{}/addPassword".format(sp.object_id)
payload = {
    "passwordCredential": {"displayName": "newlyCreatedClientSecret"},
}
response = requests.post(url, data=json.dumps(payload), headers=header)
response.raise_for_status()
secret_info = json.loads(response.text)

This request was brought up in a previous issue (#14022)

[lmazuel]

I realized I misguided you, I was thinking you need that in azure-graphrbac, but you need that from the Microsoft Graph and we dont' have it here. You might want to create your issue https://github.com/microsoftgraph/msgraph-sdk-python-core instead.