Timeline: new item and index slot props for connector slot

[robbienohra]

Describe the feature you would like to see added

Currently, style overrides to the timeline connector component happen globally at the timeline component level. It is not an uncommon use case to require dynamic style overrides across multiple connectors for a given timeline instance.

Is your feature request related to a problem?

NA

Describe the solution you'd like

Dynamic styling can be achieved (as is being done with the marker and content named slot) by binding the item property to the connector named slot. This enables the following type of customization to connectors for a given timeline.

<template #connector="slotProps">
            <div
              class="p-timeline-event-connector"
              :style="{ width: '4px', backgroundColor: slotProps.item.color }"
            ></div>
</template>

Describe alternatives you have considered

No response

Additional context

No response

[tugcekucukoglu]

Fixed via #2770