export scalars from entrypoint

[n1ru4l]

https://github.com/the-guild-org/federation/blob/e8413948430beba25ddee76145e3b753eee297bf/src/graphql/transform-supergraph-to-public-schema.ts#L12-L34

We use these in different places within Hive, so we can export them once here and then import them everywhere instead.

https://github.com/kamilkisiela/graphql-hive/blob/e31be54783f0baa3d9a5a6656bb0b032402361f0/packages/services/api/src/modules/schema/providers/registry-checks.ts#L732-L757
https://github.com/kamilkisiela/graphql-hive/blob/e31be54783f0baa3d9a5a6656bb0b032402361f0/packages/services/schema/src/orchestrators.ts#L518-L526

[trkohler]

is it relevant? may I look deeper into it?