Allow specifying `curve` and other props on LineSeries in LineChart component

### Impacted plugin

None / Other

### What

I would like to have different curve property for the line series when I use the LineChart component.

### How

Currently the line series in the LineChart component is built like this:

https://github.com/Automattic/jetpack/blob/92cd80bda476cd6f3f63eae1b81aca60fa68a40c/projects/js-packages/charts/src/components/line-chart/line-chart.tsx#L150-L157

The LineChart uses the default curveLinear factory (see https://airbnb.io/visx/docs/xychart#AnimatedLineSeries_curve). There isn't a way to specify a different curve factory.

In WooCommerce Analytics, we would like to have a different curve - see design screenshot below:


The above can be done manually by doing something like this:

```js
import { curveNatural } from '@visx/curve';

```

It would be good if the LineChart component can support different curves. Even better if it can support other LineSeries properties (not just `curve`), such as `strokeWidth` which is currently hardcoded with the value `2`.

Start in projects/js-packages/charts/src/components/line-chart/line-chart.tsx at the linked LineSeries construction and inspect how LineChart props are defined and passed through. Compare the available visx LineSeries props, including curve and strokeWidth, with the current hardcoded behavior. Done means LineChart consumers can specify a different curve and other supported LineSeries properties without losing the existing defaults.

Written by the indexing model from the issue text.