Allow selection of AssertionConsumerServiceURL in IDP-Initiated SAML login
Summary
A SAML SP may have multiple AssertionConsumerServiceURLs, for example if they are reachable through different domains.
IDP Initiated mode will redirect the user to the first URL it finds, we should add a new parameter to let users decide on which URL to send the user.
Design proposition
Add a "dest" parameter when using IDPInitiated=1