feat: Add single and multiple code pane layouts

[ZimChristine]

Description

The changes in this PR add two new slide layouts for easily adding a code with syntax highlighting and a title. There are two slide layouts:

1. a single code pane with optional title
2. multiple code panes with optional descriptions and an optional title

Type of Change

• [ x ] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Jest tests have been added for the feature.
• During development the feature was manually tested by consuming the new SlideLayouts in the example tsx app.

Checklist:

• [ x ] I have included a changeset if this change will require a version change to one of the packages.
• [ x ] I have performed a self-review of my own code
• [ x ] I have commented my code, particularly in hard-to-understand areas
• [ x ] I have made corresponding changes to the api documentation
• [ x ] I have run pnpm run check:ci and all checks pass
• [ x ] I have added tests that prove my fix is effective or that my feature works
• [ x ] My changes generate no new warnings
• [ na ] Any dependent changes have been merged and published in downstream modules

[gksander]

Looking great, I can't wait to use this! A couple little suggestions here.

[gksander]

🎈 LGTM