[FEATURE] Line Chart - Ability to apply unique line styles by series

[jayce7]

Issue Category

• [ X ] Enhancement
• Bug
• Question
• Documentation gap/issue

Product Versions

• Please specify what version of the library you are using......: [ 4.0.1 ]
• Please specify what version(s) of PowerPoint you are targeting: [ 365 version 2507 ]
• Please specify what web browser you are using.................: [ chrome ]

Desired Behavior

When creating line charts in PowerPoint, it's possible to have some series as a solid line, others with dotted line. This is used, along with colors, to indicate points of emphasis, differentiate between actuals and projections etc.

I'd like the ability to specify IChartPropsChartLine lineDash setting to specific series using an array of values (like we do when passing an array of colors as in IChartOpts chartColors).

Observed Behavior

Currently, lineDash applies to all series making the feature less useful since the point of the styles is for communicating differences between each series. If one style is applied for the whole chart, the default of a solid line is the typical choice.