Test FastGaussQuadrature and Arblib

[lxvm]

Fixes #150

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

Just adding more tests where applicable

[lxvm]

@agerlach I fixed a few issues and this pr should be ready to go.

The only significant, yet non-breaking change I had to make was to pass arbitrary keywords to the new VEGASMC algorithm so that I could seed the rng to pass the tests. Since that package has a somewhat complicated configuration, I think that was the best I could do while keeping reasonable, generic defaults. This also gives users access to all of that packages' features, like configuring assumptions about each variable of integration separately.

Also, we could reduce maintenance effort by moving test/gaussian_quadrature_tests.jl and test/quadrule_tests.jl to test/interface_tests.jl since they now overlap due to this pr. However, I think this could be combined with deprecating the GaussLegendre algorithm for a QuadratureRule(gausslegendre), so I'll leave it to a future pr.