Add Option#mapTry() (#2977)

Add `mapTry` method to Option, which is a shortcut for
`.toTry().mapTry`:
* when mapping an optional using a checked method, I find it intuitive
that the type changes to a Try, and `mapTry` methods exist on other
types already
* I initially added it onto `Value` but this ran into an issue where a
method with same name but return value already exists on subtype`Future`
  
----

Rebase of #2950

Author: bvkatwijk

vavr/src/main/java/io/vavr/control/Option.java

@@ -18,6 +18,7 @@
  */
 package io.vavr.control;
 
+import io.vavr.CheckedFunction1;
 import io.vavr.PartialFunction;
 import io.vavr.Tuple;
 import io.vavr.Value;
@@ -391,6 +392,20 @@ default <U> Option<U> map(Function<? super T, ? extends U> mapper) {
         return isEmpty() ? none() : some(mapper.apply(get()));
     }
 
+
+    /**
+     * Converts this to a {@link Try}, then runs the given checked function if this is a {@link Try.Success},
+     * passing the result of the current expression to it.
+     *
+     * @param <U>    The new component type
+     * @param mapper A checked function
+     * @return a {@code Try}
+     * @throws NullPointerException if {@code mapper} is null
+     */
+    default <U> Try<U> mapTry(CheckedFunction1<? super T, ? extends U> mapper) {
+        return toTry().mapTry(mapper);
+    }
+
     /**
      * Folds either the {@code None} or the {@code Some} side of the Option value.
      *

vavr/src/test/java/io/vavr/control/OptionTest.java

@@ -25,6 +25,7 @@
 import io.vavr.PartialFunction;
 import io.vavr.Serializables;
 import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 
 import java.util.*;
@@ -361,6 +362,35 @@ public void shouldMapNone() {
         assertThat(Option.<Integer> none().map(String::valueOf)).isEqualTo(Option.none());
     }
 
+    @Nested
+    class MapTry {
+        @Test
+        public void shouldMapTrySome() {
+            assertThat(Option.of(1).mapTry(String::valueOf)).isEqualTo(Try.success("1"));
+        }
+
+        @Test
+        public void shouldMapTryNone() {
+            Try<String> result = Option.none().mapTry(String::valueOf);
+            assertThat(result.isFailure()).isTrue();
+            assertThat(result.getCause().getClass()).isEqualTo(NoSuchElementException.class);
+            assertThat(result.getCause().getMessage()).isEqualTo("No value present");
+        }
+
+        @Test
+        public void shouldMapTryCheckedException() {
+            Try<Integer> result = Option.of("a")
+                    .mapTry(this::checkedFunction);
+            assertThat(result.isFailure()).isTrue();
+            assertThat(result.getCause().getClass()).isEqualTo(Exception.class);
+            assertThat(result.getCause().getMessage()).isEqualTo("message");
+        }
+
+        private Integer checkedFunction(String string) throws Exception {
+            throw new Exception("message");
+        }
+    }
+
     // -- flatMap
 
     @Test