support setting tokenIssuerPolicy on serviceprincipal objects to be able to control saml2 signing settings

[bassteen]

Is your feature request related to a problem? Please describe the problem.

At the moment the SDK does not allow to set the tokenIssuerPolicy on the ServicePrincipalObject.

Describe the solution you'd like.

I would like to have a call like this to be available
this.entraClient.servicePrincipals().byServicePrincipalId("id").tokenIssuancePolicies().ref().post()

Additional context?

No response

[bassteen]

for others, I found that if you add a certificate first
AddTokenSigningCertificatePostRequestBody addTokenSigningCertificatePostRequestBody = new AddTokenSigningCertificatePostRequestBody();
this.entraClient.servicePrincipals().byServicePrincipalId(spnId).addTokenSigningCertificate().post(addTokenSigningCertificatePostRequestBody);

The tokenIssuancePolicy is also created, and that one is updatable.