Render `null` values sequential values as a single line

[joao-m-santos]

Feature description

Right now, all lines in lume-line-chart are rendered with single paths between each data point.

To improve dashed line display for null values, we should find a way to render a single path for all null sequential values.

Problem/motivation

Currently, if there are multiple, sequential null values, the dashed lines will not display in a clear way.

Describe alternatives you've considered

No response

Additional context

This was reported as an issue by a consumer, so there's a use case for it. Though consumers should also think about limiting the data points / chart width.

Validations

• [X] Follow our Code of Conduct
• [X] Read the Contributing Guidelines.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.