Add EvalSSO and FindSSO Workflows

[lauritzh]

This pull request adds two workflows:

• FindSSO: Highlights requests that are likely associated with SSO flows
• EvalSSO: Add findings for basic analysis results of OAuth/OIDC SSO flows (for now "no state", "implicit flow used" and "resource owner grant used")

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Please ensure your pull request adheres to the following guidelines:

• [x] Follow the same folder structure as other workflows (see template).
• [x] Has a proper author name and workflow description.
• [ ] If using compiled code in JS Nodes, provide the source code for each.
• [ ] If using a 3rd party library, include its license as a comment in the source code.

Thanks for contributing!