channel projects (#8456)

Add plumbing for hosted projects. This will currently show them if they
exist
but provides no UX to create/rename/delete them.

Also changed the `ChannelId` type to not auto-cast to u64; this avoids
type
confusion if you have multiple id types.


Release Notes:

- N/A

crates/collab/src/db/queries/hosted_projects.rs

@@ -0,0 +1,42 @@
+use rpc::proto;
+
+use super::*;
+
+impl Database {
+    pub async fn get_hosted_projects(
+        &self,
+        channel_ids: &Vec<ChannelId>,
+        roles: &HashMap<ChannelId, ChannelRole>,
+        tx: &DatabaseTransaction,
+    ) -> Result<Vec<proto::HostedProject>> {
+        Ok(hosted_project::Entity::find()
+            .filter(hosted_project::Column::ChannelId.is_in(channel_ids.iter().map(|id| id.0)))
+            .all(&*tx)
+            .await?
+            .into_iter()
+            .flat_map(|project| {
+                if project.deleted_at.is_some() {
+                    return None;
+                }
+                match project.visibility {
+                    ChannelVisibility::Public => {}
+                    ChannelVisibility::Members => {
+                        let is_visible = roles
+                            .get(&project.channel_id)
+                            .map(|role| role.can_see_all_descendants())
+                            .unwrap_or(false);
+                        if !is_visible {
+                            return None;
+                        }
+                    }
+                };
+                Some(proto::HostedProject {
+                    id: project.id.to_proto(),
+                    channel_id: project.channel_id.to_proto(),
+                    name: project.name.clone(),
+                    visibility: project.visibility.into(),
+                })
+            })
+            .collect())
+    }
+}