Added test for two-stream instability growth rate optimization#135

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physicistphil wants to merge 6 commits intoergodicio:mainfrom

physicistphil:two-stream-opt

Commits on Oct 9, 2025

Changed numpy methods to jnp so that they're differentiable. Switched backend so that a display isn't required
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Commits on Oct 10, 2025

Commits on Oct 17, 2025

Reverted changes in modules.py so it doesn't break other scripts. Moved the diffeqsolve call to the test script itself
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Commits on Dec 3, 2025

For exploring vlasov1d parameter space
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Commits on Jan 12, 2026

Moved mpl backend code to the test script
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