Adding AZURE/GCP and other cloud based Payloads for SSRF

[preetkaran20]

Is your feature request related to a problem? Please describe. In the SSRF vulnerability, we have added the support for AWS metadata service based attack but there are many cloud vendors like gcp, openstack, alicloud, azure and we need to add support for them as well.

For more information: https://gist.github.com/BuffaloWill/fa96693af67e3a3dd3fb

We wanted to introduce new vulnerability levels for these cloud vendors to see if Scanners have payloads for finding these vendor specific vulnerabilities.

Code location: https://github.com/SasanLabs/VulnerableApp/tree/master/src/main/java/org/sasanlabs/service/vulnerability/ssrf