Images/Version Tagging for Individual Carvel Tools

Currently, Carvel tools are offered in a [single image](https://hub.docker.com/r/k14s/image) without much provided into what versions of tools are available in each tag. Additionally, there are not unique images for each tool. When trying to use Carvel tools with a tool like [Tekton](https://github.com/tektoncd/pipeline#-tekton-pipelines), which allows users to specify what image(s) to run CI/CD steps in, it can be challenging to figure out how to use specific tools/versions of tools in the process.

I am wondering if there have been discussions about supporting images for individual tools and having tagging that corresponds to tool versions (`k14s/ytt:v0.30.0`). Additionally, it would be helpful to provide more clarity around what versions of individual tools are part of the image that supports all the Carvel tools.