omniauth / omniauth-oauth2 / 40223054606

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Guard performance with Duel

Add Duel benchmarks of the strategy's hot paths, so a pull request that
makes them slower fails CI: the pass-through for requests that aren't
for the strategy, the request phase (with PKCE, and with the most
sign-ins the session keeps), and the callback phase (the state check,
the token exchange and the AuthHash, with PKCE, with the most sign-ins,
and with an unknown state).

The token endpoint is answered in process by Faraday's test adapter,
and SecureRandom is seeded, so every iteration does the same work.

Duel requires Ruby 3.4 or later, so the Gemfile adds it and the Rakefile
loads its task only there. The Perf workflow runs it on pull requests,
on pushes to master, and against the last release on a schedule.

38 of 38 branches covered (100.0%)

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127 of 127 relevant lines covered (100.0%)

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