support arrays of color and colorscale for line and fillcolor of `plotly.graph_objects.Scatter`

Coming from plotly.py. Since this is about the plotly.graph_objects module, the issue is posted here.

Currently, only plotly.graph_objects.Scatter.marker, plotly.graph_objects.Scatter.marker.gradient and plotly.graph_objects.Scatter.marker.line supports assigning colors by arrays of color along with colorscale.

Could the same color-setting techniques be allowed for plotly.graph_objects.Scatter.line and plotly.graph_objects.Scatter.fillcolor as well?

p.s. Links to the current documentation:

1. The following supports arrays of color with colorscale:

• marker.color
• marker.gradient.color
• maker.line.color

2. The following doesn't support arrays of color with colorscale:

• line.color
• fillcolor

Beginne damit nachzuverfolgen, wie Scatter.marker, marker.gradient und marker.line Farbarrays mit einer colorscale akzeptieren, und vergleiche anschließend die Behandlung von Scatter.line und fillcolor. Bestätige das erwartete Verhalten in den vorhandenen Dokumentationslinks und füge Abdeckung hinzu, die zeigt, dass Arrays für beide Eigenschaften funktionieren, ohne skalare Farben zu beeinträchtigen.