feat(types): Export types (#8)

This is helpful for annotating helper functions etc. in consumer code.
We're already using these types in our public interface but they're not
named.

Apparently you can't use `export type *` so this just names our existing
types. This might be safer if we add some internal types but it'll make
it easy to forget new types in the future.

src/fakeHr.ts

@@ -1,2 +1,8 @@
 export * as competencies from './competencies';
 export * as education from './education';
+export type {
+  CountryCode,
+  EducationInstitution,
+  EducationLevel,
+  EducationQualification,
+} from './types';