fix(mysql): percent-decode database name (#3612)

Duplicates the fix to Postgres in #3593 to the MySQL driver.

The SQLite driver already does this: https://github.com/launchbadge/sqlx/blob/e3ef8baf23bc0266959282814c014e482418eef2/sqlx-sqlite/src/options/parse.rs#L29-L32

Author: abonander

sqlx-mysql/src/options/parse.rs

@@ -38,7 +38,11 @@ impl MySqlConnectOptions {
 
         let path = url.path().trim_start_matches('/');
         if !path.is_empty() {
-            options = options.database(path);
+            options = options.database(
+                &percent_decode_str(path)
+                    .decode_utf8()
+                    .map_err(Error::config)?,
+            );
         }
 
         for (key, value) in url.query_pairs().into_iter() {