feat(core): add mutable config getter on the Context struct (#1803)

Author: lucasfernog

.changes/config-mut-getter.md

@@ -0,0 +1,5 @@
+---
+"tauri": patch
+---
+
+Adds a mutable `config` getter on the `Context` struct.

core/tauri/src/lib.rs

@@ -142,6 +142,12 @@ impl<A: Assets> Context<A> {
     &self.config
   }
 
+  /// A mutable reference to the config the application was prepared with.
+  #[inline(always)]
+  pub fn config_mut(&mut self) -> &mut Config {
+    &mut self.config
+  }
+
   /// The assets to be served directly by Tauri.
   #[inline(always)]
   pub fn assets(&self) -> Arc<A> {