Add NameIdFormat support to RelyingPartyRegistration

[Gayathri92]

RelyingPartyRegistration contains SAML 2.0 Metadata for both the relying party and its associated asserting party.

It would be nice to include NameIDFormat support in both RelyingPartyRegistration and RelyingPartyRegistration.AssertingPartyDetails. The application could then communicate a set of preferred formats to the asserting party (with #9297, for example) as well as lookup the asserting party's preferred formats.

[jzheaux]

Thanks for reaching out, @Gayathri92. Would you please add some more detail about your use case?

[spring-projects-issues]

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[amergey]

@jzheaux I saw your mention, I will try to submit a PR for this