Migrate javax.annotation.Nullable to jakarta.annotation.Nullable

[rickie]

What's changed?

Introduced support for migrating javax.annotation.Nullable to jakarta.annotation.Nullable.

What's your motivation?

When running this recipe on our internal codebase at Picnic we noticed that the javax.annotation.Nullable annotation is not being migrated to jakarta.annotation.Nullable. After some investigation it was clear that this annotation was simply missing from this recipe.

Anyone you would like to review specifically?

@timtebeek

Any additional context

To test this change, I used the ./gradlew publishToMavenLocal command and ran the recipe locally. With this change it does work and I get the following diff (random example):

+import jakarta.annotation.Nullable;
 import java.time.Duration;
 import java.time.Instant;
 import java.util.stream.Stream;
-import javax.annotation.Nullable;

[timtebeek]

Much appreciated!