Slots iteration helpers

[Spone]

Feature request

Similar to the iteration context provided when rendering collections, ViewComponent could provide contextual information, such as #size, #index, #first?, and #last?, when rendering slots that have been defined with renders_many.

Motivation

I personally encountered this need at least a dozen times in various projects. This also has been discussed in #545, #982 and #986.

[reeganviljoen]

@Spone I am trying to get more involved in view component is this possibly an issue I could help with

[Spone]

@reeganviljoen Yes, you're welcome to start working on this! Let us know if you have questions or if you need help!

[reeganviljoen]

I wrote some failing tests and a component to demonstrate what the itterators will look like #1753

[reeganviljoen]

@Spone the slot itteration counter helper has been added , I will be adding the iteration context soon

[reeganviljoen]

@Spone I have fully implemented this feature in #1753
can I ask for you to code review it since you requested this feature