Support dynamic :webc:is value

Hey! Doesn't seem like an urgent fix but...
This does not work properly (or at least not as I expected):

<div :webc:is="'my-component'" @test="Dynamic comp name does not pass props"></div>

The component renders but the test prop is not passed.

The workaround is probably to use a script.

<script webc:type="js">
  `<${"my-component"} @test="Template string comp name works"></${"my-component"}>`
  + // OR
  `<div webc:is="${"my-component"}" @test="Template string comp name works"></div>`;
</script>

Both work as expected.

My use case was the following:
I wanted to loop over an array of data with each entry containing the name of the component to be used and the props to be passed to said component.
I was trying something like this:

<div
  webc:for="block of blocks"
  :webc:is="block.tag"
  @attributes="block"
></div>

It looks super neat and compact! (but it does not work 😭😄)

Start by reproducing the :webc:is examples in the issue, including the webc:for loop, and inspect the implementation that resolves dynamic component names. Done means a component selected from a dynamic value receives its @test or @attributes props, matching the script workaround.