feat: add unstable API for dynamic program loading

web3.js/src/system-program.js

@@ -105,4 +105,35 @@ export class SystemProgram {
       userdata,
     });
   }
+
+  /**
+   * Load a dynamic program.  Unstable API, will change
+   *
+   * @private
+   */
+  static load(from: PublicKey, programId: PublicKey, name: string): Transaction {
+    const userdataLayout = BufferLayout.struct([
+      BufferLayout.u32('instruction'),
+      Layout.publicKey('programId'),
+      Layout.rustString('name'),
+    ]);
+
+    let userdata = Buffer.alloc(1024);
+    const encodeLength = userdataLayout.encode(
+      {
+        instruction: 3, // Load instruction
+        programId: programId.toBuffer(),
+        name,
+      },
+      userdata,
+    );
+    userdata = userdata.slice(0, encodeLength);
+
+    return new Transaction({
+      fee: 0,
+      keys: [from],
+      programId: SystemProgram.programId,
+      userdata,
+    });
+  }
 }