feat: enables multiple clients log in at the same time

[sidharthramesh]

Creates a client-specific CSRF session. This enables multiple clients to log in at the same time.

Related issue(s)

Fixes #3019

Similar to PR #3059

Checklist

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• [ x ] I have referenced an issue containing the design document if my change
  introduces a new feature.
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• [ x ] I have added tests that prove my fix is effective or that my feature
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[sidharthramesh]

Actually, I feel #3059 by @aarmam is less hacky than my solution here. Recommending that to be merged.

[aeneasr]

Thank you very much for your contribution! As you said, I feel a bit more comfortable with #3059 so I'll close this one here :)