[RFC]: Canberra distance between two strided arrays

### Description

This RFC proposes adding a function to calculate the Canberra distance between two strided arrays.

Package: `@stdlib/math/strided/distances/canberra`

The function should have the following signature `canberra( N, x, strideX, y, strideY )`.

The Canberra distance is a measure of dissimilarity between two samples in a data set.

The Canberra distance between two elements is as follows:

```js
(abs(x[i] - y[i]) / (abs(x[i]) + abs(y[i]))
```

See:
- [SciPy](https://docs.scipy.org/doc/scipy/reference/generated/scipy.spatial.distance.canberra.html#scipy.spatial.distance.canberra)
- [compute-io](https://github.com/compute-io/canberra-distance)

### Related Issues

None.

### Questions

No.

### Other

No.

### Checklist

- [X] I have read and understood the [Code of Conduct](https://github.com/stdlib-js/stdlib/blob/develop/CODE_OF_CONDUCT.md).
- [X] Searched for existing issues and pull requests.
- [X] The issue name begins with `RFC:`.

Start with the @stdlib/math/strided/distances/canberra package path and review the RFC's proposed signature and Canberra-distance formula. Compare the package's conventions with the linked SciPy and compute-io references; the work is complete when the package provides the specified calculation for strided arrays.

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