Add configurable metadata to S3 content delivery

[chcatf]

Is your feature request related to a problem? Please describe.
We use a self-hosted S3 bucket (non-AWS) that syncs with a CDN and the TTL of any stored object is controlled by the Cache-Control field of each object's metadata.

Describe the solution you'd like
An input added to the content delivery configuration form to set custom metadata on the uploaded translation files such as from here https://github.com/tolgee/tolgee-platform/blob/main/backend/data/src/main/kotlin/io/tolgee/component/fileStorage/S3FileStorage.kt#L44

Describe alternatives you've considered
Alternatives are all manual/cron solutions of overwriting existing objects with the proper metadata.