Add 2-argument higher-order type and move kinds to their own package

I don't think that we will have higher-order types with more than 2 parameters, so I only made K and K2

common/api/src/main/java/com/dfsek/terra/api/util/generic/Applicative.java

@@ -1,5 +1,7 @@
 package com.dfsek.terra.api.util.generic;
 
+import com.dfsek.terra.api.util.generic.kinds.K;
+
 import java.util.function.Function;
 
 

common/api/src/main/java/com/dfsek/terra/api/util/generic/Monad.java

@@ -1,5 +1,7 @@
 package com.dfsek.terra.api.util.generic;
 
+import com.dfsek.terra.api.util.generic.kinds.K;
+
 import java.util.function.Function;
 
 

common/api/src/main/java/com/dfsek/terra/api/util/generic/Monoid.java

@@ -1,5 +1,8 @@
 package com.dfsek.terra.api.util.generic;
 
+import com.dfsek.terra.api.util.generic.kinds.K;
+
+
 public interface Monoid<T, M extends K<M, T>> extends Semigroup<T, M>{
     <T1, M1 extends K<M1, T1>> Monoid<T1, M1> identity();
 

common/api/src/main/java/com/dfsek/terra/api/util/generic/Semigroup.java

@@ -1,5 +1,8 @@
 package com.dfsek.terra.api.util.generic;
 
+import com.dfsek.terra.api.util.generic.kinds.K;
+
+
 public interface Semigroup<T, S extends K<S, T>> {
     Semigroup<T, S> multiply(S t);
 }

common/api/src/main/java/com/dfsek/terra/api/util/generic/kinds/K.java

@@ -1,4 +1,4 @@
-package com.dfsek.terra.api.util.generic;
+package com.dfsek.terra.api.util.generic.kinds;
 
 /**
  * Kind

common/api/src/main/java/com/dfsek/terra/api/util/generic/kinds/K2.java

@@ -0,0 +1,7 @@
+package com.dfsek.terra.api.util.generic.kinds;
+
+/**
+ * Kind of the type T<A, B>
+ */
+public interface K2<T, A, B> {
+}