httpd: Update stats to count all projects, and amount of users followed — heartwood

Instead of filtering private projects for a total project count, we should count all projects, even private ones.

Also instead of showing a user count of 0, I think we should display how many users a node is following.

 use axum::response::IntoResponse;
 use axum::routing::get;
 use axum::{Json, Router};
 use radicle::storage::ReadStorage as _;
 use serde_json::json;
 use crate::api::error::Error;

 /// Return the stats for the node.
 /// `GET /stats`
 async fn stats_handler(State(ctx): State<Context>) -> impl IntoResponse {
     let storage = &ctx.profile.storage;
     let projects = storage.inventory()?.len();
     let total = ctx.profile.storage.repositories()?.len();
     Ok::<_, Error>(Json(
         json!({ "projects": { "count": projects }, "users": { "count": 0 } }),
     ))
     Ok::<_, Error>(Json(json!({ "repos": { "total": total } })))
 }
 #[cfg(test)]

         let response = get(&app, "/stats").await;
         assert_eq!(response.status(), StatusCode::OK);
         assert_eq!(
             response.json().await,
             json!({
                 "projects": {
                     "count": 1
                 },
                 "users": {
                     "count": 0
                 }
             })
         );
         assert_eq!(response.json().await, json!({ "repos": { "total": 2 } }));
     }
 }