respect size and level parameters

* Add size and level parameters to ChallengeProvider.returnChallenge()
* Add size column to challenge table
* Pass size and level parameters to all relevant calls
* Add size field to demo app

src/main/java/lc/captchas/FontFunCaptcha.java

@@ -81,7 +81,7 @@ public class FontFunCaptcha implements ChallengeProvider {
     return baos.toByteArray();
   }
 
-  public Challenge returnChallenge() {
+  public Challenge returnChallenge(String level, String size) {
     String secret = HelperFunctions.randomString(7);
     String path = "./lib/fonts/";
     return new Challenge(fontFun(secret, "medium", path), "image/png", secret.toLowerCase());

src/main/java/lc/captchas/PoppingCharactersCaptcha.java

@@ -100,7 +100,7 @@ public class PoppingCharactersCaptcha implements ChallengeProvider {
         "supportedInputType", List.of("text"));
   }
 
-  public Challenge returnChallenge() {
+  public Challenge returnChallenge(String level, String size) {
     final var secret = HelperFunctions.randomString(6);
     return new Challenge(gifCaptcha(secret), "image/gif", secret.toLowerCase());
   }

src/main/java/lc/captchas/ShadowTextCaptcha.java

@@ -74,7 +74,7 @@ public class ShadowTextCaptcha implements ChallengeProvider {
     return baos.toByteArray();
   }
 
-  public Challenge returnChallenge() {
+  public Challenge returnChallenge(String level, String size) {
     String secret = HelperFunctions.randomString(6);
     return new Challenge(shadowText(secret), "image/png", secret.toLowerCase());
   }

src/main/java/lc/captchas/interfaces/ChallengeProvider.java

@@ -6,7 +6,7 @@ import java.util.List;
 public interface ChallengeProvider {
   public String getId();
 
-  public Challenge returnChallenge();
+  public Challenge returnChallenge(String level, String size);
 
   public boolean checkAnswer(String secret, String answer);