Add relative shift location selection to interpolator interface. This will allow wrapping dsp.timeshift.

This includes a rewrite of the Lagrange interpolator using a new algorithm based on FIR filters.

Resolve "Allow to set the random noise generator seeds"

Closes #157

See merge request !187

Resolve "Implement a first simple version of the documentation"

Closes #156

See merge request !186

Resolve "Use Poetry"

Closes #155

See merge request !185

Resolve "Add compatibility with LISA Glitch 1.4"

Closes #154

See merge request !183