RNG Crate Patch

[Jonhas-qtm]

This patch refactors the previous workflow of building the RNG library, which started from a C library which was then used to generate a a Rust library to then finally generate python bindings. Now, it uses a single Rust RNG crate, from which Python bindings are directly generated.

Additionally, the global RNG State is no longer static nor global, so any weird behavior involving threads should be nullified. This patch is inherently responding to #166 as well.

[qciaran]

Having pyo3 in pecos-rng is counter to PECOS's current design. All the PyO3 stuff is currently exposed in python/pecos-rslib/. peos-rslib is essentially the central Rust->Python bridge for PECOS.

pecos-rng should be re-exported in the pecos meta crate's prelude and then exposed to the Python side in pecos-rslib, which takes the pecos crate and does all the PyO3 stuff.

[Jonhas-qtm]

Having pyo3 in pecos-rng is counter to PECOS's current design. All the PyO3 stuff is currently exposed in python/pecos-rslib/. peos-rslib is essentially the central Rust->Python bridge for PECOS.

pecos-rng should be re-exported in the pecos meta crate's prelude and then exposed to the Python side in pecos-rslib, which takes the pecos crate and does all the PyO3 stuff.

latest changes responds to this

[ciaranra]

LGTM