feat: load RSA public key via modulus and exponent

key-pair-loader/src/main/java/com/onixbyte/security/KeyLoader.java

@@ -17,8 +17,11 @@
 
 package com.onixbyte.security;
 
+import com.onixbyte.security.exception.KeyLoadingException;
+
 import java.security.PrivateKey;
 import java.security.PublicKey;
+import java.security.interfaces.RSAPublicKey;
 
 /**
  * The {@code KeyLoader} class provides utility methods for loading keys pairs from PEM-formatted
@@ -49,6 +52,10 @@ public interface KeyLoader {
      */
     PublicKey loadPublicKey(String pemKeyText);
 
+    default RSAPublicKey loadPublicKey(String modulus, String exponent) {
+        throw new KeyLoadingException("This key loader does not support RSA Public key loading.");
+    }
+
     /**
      * Retrieves the raw content of a PEM formatted key by removing unnecessary headers, footers,
      * and new line characters.