Refactor redundant Default implementations using a shared macro

Introduced a shared macro `impl_default_new!` in `src/common.rs` to
automate the implementation of the `Default` trait for types that
delegate directly to their `new()` method. This reduces boilerplate
and improves maintainability across `src/api.rs`, `src/batch.rs`, and
`src/decompress/mod.rs`.

Author: 404Setup

src/api.rs

@@ -130,11 +130,7 @@ pub struct Decompressor {
     limit_ratio: usize,
 }
 
-impl Default for Decompressor {
-    fn default() -> Self {
-        Self::new()
-    }
-}
+crate::impl_default_new!(Decompressor);
 
 impl Decompressor {
     pub fn new() -> Self {

src/batch.rs

@@ -41,11 +41,7 @@ impl BatchCompressor {
 
 pub struct BatchDecompressor;
 
-impl Default for BatchDecompressor {
-    fn default() -> Self {
-        Self::new()
-    }
-}
+crate::impl_default_new!(BatchDecompressor);
 
 impl BatchDecompressor {
     pub fn new() -> Self {

src/common.rs

@@ -84,3 +84,15 @@ pub fn slice_as_uninit_mut(slice: &mut [u8]) -> &mut [std::mem::MaybeUninit<u8>]
         )
     }
 }
+
+#[macro_export]
+macro_rules! impl_default_new {
+    ($t:ty) => {
+        impl Default for $t {
+            #[inline(always)]
+            fn default() -> Self {
+                Self::new()
+            }
+        }
+    };
+}

src/decompress/mod.rs

@@ -84,11 +84,7 @@ pub enum DecompressResult {
     ShortInput,
 }
 
-impl Default for Decompressor {
-    fn default() -> Self {
-        Self::new()
-    }
-}
+crate::impl_default_new!(Decompressor);
 
 impl Decompressor {
     pub fn new() -> Self {