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Calculate mixed-trigonometric-polynomial moment of random variables

reference method: [Moment-Based Exact Uncertainty Propagation Through Nonlinear Stochastic Autonomous Systems](https://arxiv.org/abs/2101.12490)

The distributions of the random variables are normal, uniform, and exponential.
```toml
[dependencies]
tri_poly_moment = "0.1.0"
```

# Example
if calculate moment of Gaussian distribusions

```
use tri_poly_moment::Gaussian;
let arg = Gaussian::new(-2.1, 0.4 * 0.4);
arg.x(); //if calc E[x], arg.x() = -2.1
```