chore: Add type references to package.json

[kevintyj]

What changed / motivation ?

Adds "types" to all of the packages' package.json (if the build output includes a type declaration)

Linked PR/Issues

#46

Additional Context

TS Docs

Pre-flight Checklist

• [x] I have read the contributing guidelines
• [x] I have signed the contributing agreement
• [ ] I have written unit tests where necessary (If it is a feature commit)
• [x] Performed a self-review of my code
• [x] Made sure PR title follows the conventional commit specification