Finish converting most of the undeprecated api to jspecify

patches/api/0287-Missing-Entity-API.patch

@@ -16,19 +16,20 @@ Co-authored-by: TotalledZebra <Holappa57@gmail.com>
 
 diff --git a/src/main/java/io/papermc/paper/entity/SchoolableFish.java b/src/main/java/io/papermc/paper/entity/SchoolableFish.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..39ad7d283609d7e427a2ab35b6fad839e032fe92
+index 0000000000000000000000000000000000000000..a16329a8d08c74ce58960ff9dcc0af098b8543e9
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/entity/SchoolableFish.java
 @@ -0,0 +1,47 @@
 +package io.papermc.paper.entity;
 +
 +import org.bukkit.entity.Fish;
-+import org.jetbrains.annotations.NotNull;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.NullMarked;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Represents a fish that can school with other fish.
 + */
++@NullMarked
 +public interface SchoolableFish extends Fish {
 +
 +    /**
@@ -36,7 +37,7 @@ index 0000000000000000000000000000000000000000..39ad7d283609d7e427a2ab35b6fad839
 +     *
 +     * @param leader fish to follow
 +     */
-+    void startFollowing(@NotNull SchoolableFish leader);
++    void startFollowing(SchoolableFish leader);
 +
 +    /**
 +     * Causes the fish to stop following their current
@@ -63,8 +64,7 @@ index 0000000000000000000000000000000000000000..39ad7d283609d7e427a2ab35b6fad839
 +     *
 +     * @return following fish
 +     */
-+    @Nullable
-+    SchoolableFish getSchoolLeader();
++    @Nullable SchoolableFish getSchoolLeader();
 +
 +}
 diff --git a/src/main/java/org/bukkit/entity/AbstractHorse.java b/src/main/java/org/bukkit/entity/AbstractHorse.java