Add performance tutorial for EuroSciPy 2022 (#72)

* tutorial on performance for Euroscipy

* added line-profiler to requirements

* replace time calls by timeit magic

* line-profiler version

Co-authored-by: Emmanuelle Gouillart <[email protected]>

Author: emmanuelle

lectures/7_performance.ipynb

@@ -5,3 +5,4 @@ matplotlib >= 3.5
 notebook >= 6.4
 scikit-learn >= 1.0
 packaging >= 21.3
+line-profiler >= 3.3