fix(java): Fix error with MemoryBuffer::readBytesAsInt64 when not in LITTLE_ENDIAN mode #2068 (#2069)

## What does this PR do?

Fix the issue with `MemoryBuffer::readBytesAsInt64` when the system is
not in LITTLE_ENDIAN mode.

## Related issues
- Fix #2068

## Does this PR introduce any user-facing change?

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- [ ] Does this PR introduce any public API change?
- [ ] Does this PR introduce any binary protocol compatibility change?

## Benchmark

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Author: LouisLou2

java/fury-core/src/main/java/org/apache/fury/memory/MemoryBuffer.java

@@ -2198,10 +2198,9 @@ public long readBytesAsInt64(int len) {
     int remaining = size - readerIdx;
     if (remaining >= 8) {
       readerIndex = readerIdx + len;
-      long v =
-          UNSAFE.getLong(heapMemory, address + readerIdx)
-              & (0xffffffffffffffffL >>> ((8 - len) * 8));
-      return LITTLE_ENDIAN ? v : Long.reverseBytes(v);
+      long v = UNSAFE.getLong(heapMemory, address + readerIdx);
+      v = (LITTLE_ENDIAN ? v : Long.reverseBytes(v)) & (0xffffffffffffffffL >>> ((8 - len) * 8));
+      return v;
     }
     return slowReadBytesAsInt64(remaining, len);
   }