Hi,
Please find my answers below -
1) Does WAF support TACACS, SAML, AAD, LDAP , Kerberos, RADIUS ?
AFAIK, SAML is not yet supported by Azure WAF and the rest are regular Firewall /Appliance Firewall based requirement. If you are particular about them, Have look at Cloudflare or Barracuda.
2) Compliance GDPR, Sarbanes-Oxley, HIPAA, PCI-DSS, SOC2
Not all, GDPR, PCI-DSS and HIPPA --- Please take a look on this document -- https://azure.microsoft.com/en-us/resources/microsoft-azure-compliance-offerings/
3) Is there any to test WAF with in the Azure with all the imposed rules such OWASP. Third party tools such as Burpsuite can be used but want to check if there are any internal solutions
Not sure about this, plz post it as different question
4) NGE encryption, cipher suites, DH groups, hashing, SHA-2, AES,x.509 certificates
There are limitations on this. But there is a provision through keyvault. -- This explains - https://learn.microsoft.com/en-us/azure/application-gateway/key-vault-certs
5) Does it support connection pooling
Yes, if you are talking about back end pooling
6) Ability to install signatures
Same as 4th answer
7) Ability to configure/enforce IETF
This is big subject, usually, WAF enforces the same which is app following. But you need to checkpoint to point of rules.