Support `list` verb in `resource` templates

# Summary

Currently resource templates only support `get, create, apply, delete, replace, patch`. Listing is something that very commonly required as well. There should be a default way to list by label selectors without specifying name or optionally even namespace.

# Motivation

I find it fairly self-explanatory when a list is required over a Get :). But namely, anytime you need more than one resource that matches a set of labels, or more broadly, any time you know a label a resource has, but not necessarily it's name or namespace.

# Proposal

I would like to see this implemented in a manner that mimics the `action: get` interface, but name and namespace, and lables are optional. If name is supplied, then it can behave like a Get. Basically I would like it work similar to how kubectl works.

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**Message from the maintainers**:

If you wish to see this enhancement implemented please add a 👍 reaction to this issue! We often sort issues this way to know what to prioritize.

Start by locating the resource template handling for the existing get action and review how resource names, namespaces, and label selectors are represented. Done means a list verb is supported with label selectors, optional name and namespace, and behavior consistent with the proposal and kubectl-style listing.

Written by the indexing model from the issue text.