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[FEATURE] `saml2aws console` to support new AWS feature "Signing in to multiple accounts"
AWS Web Console has now multi-session support - can saml2aws console support that?
https://docs.aws.amazon.com/awsconsolehelpdocs/latest/gsg/multisession.html
It seems they now prefix now the web console URL with something like ${ACCOUNT_ID}-${8CHAR_HASH}-{REGION}.console.aws.amazon.com
Opt-in is done via
https://us-east-1.signin.aws.amazon.com/sessions/v1/opt-in?redirect_uri=https%3A%2F%2Fus-east-1.console.aws.amazon.com%2Fconsole%2Fhome%3Fregion%3Dus-east-1%26newPrism%3Dtrue%23
which responds with a redirect to:
https://us-east-1.console.aws.amazon.com/console/home?region=us-east-1&newPrism=true&login_hint=ACCOUNT_ID-8CHARS
login_hint is determisitic over several sessions and seems to be [0-9a-z]{8}