556 code blocks

[andrewrisse]

Adds formatting for code blocks.

Node about the new CodeBlock.svelte component:

The markdown-it highlight option used in Message.svelte does not allow us to insert normal Svelte components in the
code block that it returns. This CodeBlock.svelte component is instead used as a web component within that
function to properly render the code blocks with highlighting and a copy button.
We have to forgo shadow root creation so that styles are no longer encapsulated (e.g. shadow: 'none') in the
customElement definition above.
In order to access styles from highlight.js and carbon, we import those sub-components into this one.
Trying to use the styles from within this component will not work.

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