WIP: Add repository entries to collab and synchronize when rejoining the room

co-authored-by: Max <max@zed.dev>

crates/collab/src/db/worktree_repository.rs

@@ -0,0 +1,22 @@
+use super::ProjectId;
+use sea_orm::entity::prelude::*;
+
+#[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]
+#[sea_orm(table_name = "worktree_repositories")]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    pub project_id: ProjectId,
+    #[sea_orm(primary_key)]
+    pub worktree_id: i64,
+    #[sea_orm(primary_key)]
+    pub dot_git_entry_id: i64,
+    pub scan_id: i64,
+    pub branch: Option<String>,
+    pub work_directory_path: String,
+    pub is_deleted: bool,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {}
+
+impl ActiveModelBehavior for ActiveModel {}