New endpoint to return project node ID for tracked files

For the Downloads OKR https://gitlab.eclipse.org/groups/eclipsefdn/okrs/-/epics/64, we will need a highly cached and performant endpoint that will return a project node ID of a tracked file if available. If available, the return should be plain text with just the node ID and status 200, where a non-tracked file should return a 404. We will need to ensure that this cached in memory and aggressively to make the return as fast as possible.