refactor(metal): reorganize data structure into new types

- for better get_constant.metal usage

- Moved BigInt and Jacobian struct definitions to a new types.metal file for better organization.
- Updated bigint.metal to include get_constant.metal instead of constants.metal.
- Removed unused struct definitions from jacobian.metal to streamline the code.
- Enhanced modularity by separating type definitions from function implementations.

mopro-msm/src/msm/metal_msm/shader/bigint/bigint.metal

@@ -1,15 +1,8 @@
 // source: https://github.com/geometryxyz/msl-secp256k1
 
 using namespace metal;
-#include "../constants.metal"
+#include "../misc/get_constant.metal"
 
-struct BigInt {
-    array<uint, NUM_LIMBS> limbs;
-};
-
-struct BigIntWide {
-    array<uint, NUM_LIMBS_WIDE> limbs;
-};
 
 BigInt bigint_zero() {
     BigInt s;

mopro-msm/src/msm/metal_msm/shader/curve/jacobian.metal

@@ -6,16 +6,6 @@ using namespace metal;
 #include <metal_math>
 #include "../mont_backend/mont.metal"
 
-struct Jacobian {
-    BigInt x;
-    BigInt y;
-    BigInt z;
-};
-
-struct Affine {
-    BigInt x;
-    BigInt y;
-};
 
 Jacobian jacobian_add_2007_bl(
     Jacobian a,

mopro-msm/src/msm/metal_msm/shader/misc/get_constant.metal

@@ -1,6 +1,7 @@
 using namespace metal;
 #include <metal_stdlib>
-#include "../bigint/bigint.metal"
+#include "../constants.metal"
+#include "../misc/types.metal"
 
 BigInt get_mu() {
     BigInt mu;

mopro-msm/src/msm/metal_msm/shader/misc/types.metal

@@ -0,0 +1,21 @@
+using namespace metal;
+#include <metal_stdlib>
+
+struct BigInt {
+    array<uint, NUM_LIMBS> limbs;
+};
+
+struct BigIntWide {
+    array<uint, NUM_LIMBS_WIDE> limbs;
+};
+
+struct Jacobian {
+    BigInt x;
+    BigInt y;
+    BigInt z;
+};
+
+struct Affine {
+    BigInt x;
+    BigInt y;
+};