Action should support Azure SP internally

[ntgiwsvp]

Hello,

for Azure, I like the recommended usage you describe in the README, leveraging an Azure Service Principal. However, the step to generate the AAD token for the SP is a bit cumbersome and makes the workflows look clumsy. Would it be possible to add AZURE_SP_APPLICATION_ID, AZURE_SP_TENANT_ID, and AZURE_SP_CLIENT_SECRET as input parameters to the action so that the token generation can be performed by the action itself in case no PAT is available?