do not use cvode for stochastic models

[AurelienJaquier]

Should fix issue raised in https://github.com/openbraininstitute/prod-platform-architecture/issues/15

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
bluecellulab/analysis/inject_sequence.py	97.91% <100.00%> (+0.06%)	⬆️

... and 3 files with indirect coverage changes

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[AurelienJaquier]

I am using template_accepts_cvode here, but this code is not resilient if unexpected stochastic ion channel are used. We can use it for now because we only have StochKv* stochastic ion channel in the platform, but we should maybe think of a better solution.