Add support for loading native code: Rust, C++

[mandar2812]

This issue/task is quite large in terms of scope and implications. One can consider several capabilities that can be seen as objectives which the native interface/connection will need to achieve

Objectives

1. Optimising kernel computations; more specifically of classes implementing LocalScalarKernel[I]. This should ideally be done at the level of the evaluate(x: I, y: I) function of the common kernel implementations like RBFKernel, FBMKernel, PolynomialKernel and others.

2. Implementing models in native code and connecting them to the DynaML Model[T, Q, R] trait.

Languages

In order of preference.

1. Rust
2. C++

Compatibility Layers

A number of java compatibility interfaces can be considered and with some deliberation one of them can be finalised.

1. JNI: Java Native Interface
2. JNA: Java Native Access, with [BridJ] backend
3. FFI: Java Abstracted Foreign Function Layer

Resources

1. Java-Rust-FFI
2. Java-Rust-Example