[Java] Add Dataset based on MemorySegment (rapidsai#1034)

This PR adds the ability to define a Dataset directly over a MemorySegment, "wrapping" it instead of allocating a new one.

- Depends on rapidsai#1033 and rapidsai#1024
- ~~The new API has a `Object memorySegment` parameter, as we target Java 21 for the API (but 22 for the implementation); it works but it's definitely a hack and we need to sort this out~~
   - As discussed, we want to keep targeting Java 21 for the API. This means the API will return a `MethodHandle`, and the Java 22 implementation will use it to return a factory method to build a Dataset from a MemorySegment.
   - This factory method can then be used as shown in the tests (see the `DatasetHelper` convenience class/method).
- Benchmarks show a sizeable speedup -- it is still tiny related to the "big picture" (index build time), but there is an improvement and above all we avoid a whole new copy of the input data (halving the memory requirements).

Fixes rapidsai#698

Authors:
  - Lorenzo Dematté (https://github.com/ldematte)
  - MithunR (https://github.com/mythrocks)
  - Ben Frederickson (https://github.com/benfred)

Approvers:
  - Chris Hegarty (https://github.com/ChrisHegarty)
  - MithunR (https://github.com/mythrocks)

URL: rapidsai#1034

Author: punAhuja

java/cuvs-java/src/main/java22/com/nvidia/cuvs/spi/JDKProvider.java

@@ -42,6 +42,9 @@
 import java.lang.foreign.Arena;
 import java.lang.foreign.MemoryLayout;
 import java.lang.foreign.MemorySegment;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Objects;