feat(gva): re-expose feature explorer

Cargo.toml

@@ -40,6 +40,9 @@ serde_json = "1.0.53"
 tokio = { version = "1.2", features = ["macros", "rt-multi-thread", "time"] }
 unwrap = "1.2.1"
 
+[features]
+explorer = ["duniter-gva-db/explorer", "duniter-gva-indexer/explorer"]
+
 [workspace]
 members = [
     "bda",