feat: improve UI for timespan inputs on admin page (#726)

* Define Timestamp type

* Implement Timestamp utils

* Implement Timespan input

* Use timestamp input on config page

* Add timespan type to config services

* Refactor maxExpiration to use timespan type across services and components

* Update sessionDuration to use timespan type in config and adjust token expiration logic

* Update localized strings

frontend/src/pages/upload/index.tsx

@@ -139,7 +139,7 @@ const Upload = ({
           "share.allowUnauthenticatedShares",
         ),
         enableEmailRecepients: config.get("email.enableShareEmailRecipients"),
-        maxExpirationInHours: config.get("share.maxExpiration"),
+        maxExpiration: config.get("share.maxExpiration"),
         shareIdLength: config.get("share.shareIdLength"),
         simplified,
       },