Add seed for random number generators #Enhancement

[renereimann]

A nice enhancement of the code would be to be able to set the seed of random number generators. That would allow to reproduce the "noise" of a measurement. That is e.g. helpfull when running jobs on a cluster that all should work with the same measurement.

[renereimann]

Modification has to go into https://github.com/MCFlowMace/likelihood-tools/blob/develop/likelihoodtools/likelihood.py#L48

proposed change:

rng = np.random.default_rng(seed=self.seed)
n = data.size
noise = rng.normal(loc=0, scale=sigma/np.sqrt(2), size=(n, 2)).view(np.complex128)
noise = noise.reshape(data.shape)