Enable AWS SSO support

[rmak-cpi]

Issue: #108

Description: Set session.Options.SharedConfigState to session.SharedConfigEnable to enable aws sso support.

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[trondhindenes]

this really needs to get merged. We're building from the PR branch for the time being.

[nomeelnoj]

@trondhindenes did you get the custom build working with Docker? Running the custom build via binary seems to work, but on the scratch docker image it does not, and I still get the same error. If I change the docker image to something like ubuntu:latest it works, so I am guessing there is some hidden utility that SSO requires that is not present in scratch. If you have figured it out with scratch, I would love to know if I am just missing something obvious.

[trondhindenes]

hm I think we just built it locally I'm afraid. Didn't have any problems with that.

[trondhindenes]

tbh this repo seems more or less abandoned to me, such an important feature as this being just left pending is simply nuts. Maybe it would make sense to semi-officially fork it since AWS doesn't seem to be willing to maintain it.