TESTS: Use a more meaningful performance data set length

This value is now a multiple of a standard sampling frequency, making
the estimation of actual audio data processing time easier.

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
DESCRIPTORS: Add more asserts on input parameters

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
ALGORITHMS: Remove useless includes

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
ALGORITHMS: Remove useless copy

These explicit copies can be replaced by using Eigen dedicated Map object.

Signed-off-by: Gama <misept.dieseneuf@gmail.com>