feat(kratos): saml federation

[sebferrer]

This is related to our SAML federation PR in Kratos : ory/kratos#2653

Related Issue or Design Document

ory/kratos#1928

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• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
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• I have added tests that prove my fix is effective or that my feature works.
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[Benehiko]

This looks good :)

Please rebase on the latest changes on master. We have updated the SDK version to v1.1.0 now and also have a make command to pull in the SDK from Kratos locally for testing.
https://github.com/ory/elements#using-local-ory-sdks

We can merge this once this PR has been merged:
ory/kratos#2653

[sebferrer]

Thank you @Benehiko!
Okay I'll do that soon :)