Feature Request: bestfit_line(points)

# Feature Request

As a [user], I want [to analyse some measured 3D points and fit them to a line] so that [benefit].

## Details

**Is your feature request related to a problem? Please describe.**
I was trying to find a bestfit line function in compas.
Turns out there are the more complex `bestfit_frame_numpy`, `bestfit_plane`, `bestfit_plane_numpy `and `bestfit_sphere_numpy`, but not bestfit_line.

**Describe the solution you'd like**
Just similar to other fitting analysis, I assume it can be a numpy implementation.

**Describe alternatives you've considered**
I put together something myself using numpy copying some code I found online:
```
data = np.array(measured_points)
datamean = data.mean(axis=0)
uu, dd, vv = np.linalg.svd(data - datamean)
line_vector = vv[0]
```

**Additional context**
Add any other context or screenshots about the feature request here.