feat: improve string literal typings

[paul-vd]

This will allow intellisense to understand available string literals while allowing custom string values, see https://twitter.com/Nemuksis/status/1693909021143532005

Notes

• The first commit adds the logic which appends the &{} to string literals (feat: improve string literal typings)
• The second commit updates all the .d.ts declarations (chore: update .d.ts typings)
• The third commit adds the changelog (chore: update changelog)

Fixes

#4268 (#4155)

Checklist

• .d.ts file is updated
• changelog is added, npm run add-change