chore: add tsconfig file within component package to generate the TS declaration files

[annawen1]

Closes #265

To generate the d.ts declaration files in the rollup output, each component package needs to have a tsconfig.json file. This adds some duplication but seems like it is necessary to get the output with the correct folder structure.

Changelog

New

• add a tsconfig.json file within the component package

Changed

• use the usePrefix hook that's now in the @carbon-labs/utilities package
• moved the stackblitz link lower in the storybook mdx file for the ExampleButton

Testing / Reviewing

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