Also mmap terms index (`.tip`) files for hybridfs (#43150)

This change adds the terms index (`.tip`) to the list of extensions
that are memory-mapped by hybridfs. These files used to be accessed
only once to load the terms index on-heap but since #42838 they can
now be used to read the binary FST directly so it is benefical to
memory-map them instead of accessing them via NIO.

server/src/main/java/org/elasticsearch/index/store/FsDirectoryFactory.java

@@ -157,6 +157,7 @@ public class FsDirectoryFactory implements IndexStorePlugin.DirectoryFactory {
                 case "nvd":
                 case "dvd":
                 case "tim":
+                case "tip":
                 case "cfs":
                     return true;
                 default:

server/src/test/java/org/elasticsearch/index/store/FsDirectoryFactoryTests.java

@@ -61,6 +61,7 @@ public class FsDirectoryFactoryTests extends ESTestCase {
             assertTrue(hybridDirectory.useDelegate("foo.dvd"));
             assertTrue(hybridDirectory.useDelegate("foo.nvd"));
             assertTrue(hybridDirectory.useDelegate("foo.tim"));
+            assertTrue(hybridDirectory.useDelegate("foo.tip"));
             assertTrue(hybridDirectory.useDelegate("foo.cfs"));
             assertFalse(hybridDirectory.useDelegate("foo.bar"));
             MMapDirectory delegate = hybridDirectory.getDelegate();