DatabaseSource::Auto (#9500)

* implement "auto" database backend in client/db, in progress, #9201

* move fn supports_ref_counting from DatabaseSource enum to Database trait to make it work correctly for all types of dbs

* update kvdb_rocksdb to 0.13 and use it's new config feature  to properly auto start existing database

* tests for auto database reopening

* introduce OpenDbError to cleanup opening database error handling and handle case when database is not enabled at the compile time

* cargo fmt strings again

* cargo fmt strings again

* rename DataSettingsSrc to fix test compilation

* fix the call to the new kvdb-rocksdb interdace in tests to fix compilation

* simplify OpenDbError and make it compile even when paritydb and rocksdb are disabled

* cargo fmt

* fix compilation without flag with-parity-db

* fix unused var compilation warning

* support different paths for rocksdb and paritydb in DatabaseSouce::Auto

* support "auto" database option in substrate cli

* enable Lz4 compression for some of the parity-db colums as per review suggestion

* applied review suggestions

substrate/bin/node/bench/src/tempdb.rs

@@ -91,8 +91,7 @@ impl TempDatabase {
 		match db_type {
 			DatabaseType::RocksDb => {
 				let db_cfg = DatabaseConfig::with_columns(1);
-				let db = Database::open(&db_cfg, &self.0.path().to_string_lossy())
-					.expect("Database backend error");
+				let db = Database::open(&db_cfg, &self.0.path()).expect("Database backend error");
 				Arc::new(db)
 			},
 			DatabaseType::ParityDb => Arc::new(ParityDbWrapper({
@@ -101,7 +100,7 @@ impl TempDatabase {
 				column_options.ref_counted = true;
 				column_options.preimage = true;
 				column_options.uniform = true;
-				parity_db::Db::open(&options).expect("db open error")
+				parity_db::Db::open_or_create(&options).expect("db open error")
 			})),
 		}
 	}