feat(sql,store): add `Builder::new`

ref: https://github.com/tauri-apps/tauri/issues/8880

.changes/sql-store-new-fn.md

@@ -0,0 +1,6 @@
+---
+"sql": "patch"
+"store": "patch"
+---
+
+Add `Builder::new` method.

plugins/sql/src/plugin.rs

@@ -273,6 +273,10 @@ pub struct Builder {
 }
 
 impl Builder {
+    fn new() -> Self {
+        Self::default()
+    }
+
     /// Add migrations to a database.
     #[must_use]
     pub fn add_migrations(mut self, db_url: &str, migrations: Vec<Migration>) -> Self {

plugins/store/src/lib.rs

@@ -209,6 +209,10 @@ impl<R: Runtime> Default for Builder<R> {
 }
 
 impl<R: Runtime> Builder<R> {
+    fn new() -> Self {
+        Self::default()
+    }
+
     /// Registers a store with the plugin.
     ///
     /// # Examples