Cypari speedup#12
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Flipper_speed was not a unit test
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This PR provides a major speedup when using the
cypariandcypari2backends. Specifically, it uses PARI to compute polynomial roots rather thansympy, since profiling offlippercomputations showed that this was the bottleneck. I also improved caching ofBaseRealNumberField.intervalsandBaseRealAlgebraic.inverval. The scripttest/flipper_speed.pyruns 60 times faster with this PR on my MacBook Air M2 (15 minutes -> 15 seconds).