Refactor: MORI-IO add support for multi-session batch transfers

[maning00]

Motivation

The current batch API is limited to read/write operations within a single transfer session (one source, one destination). To improve performance and reduce API call overhead, this PR extends the API to support batching multiple, independent transfers in a single call.

API Change

The BatchRead and BatchWrite functions are overloaded to accept vectors of transfer parameters. This allows each entry in the batch to have its own source/destination memory descriptors, status pointers, and transfer IDs.

Old API (Single Session)

  void IOEngine::BatchRead(const MemoryDesc& localDest, const SizeVec& localOffsets,
                 const MemoryDesc& remoteSrc, const SizeVec& remoteOffsets, const SizeVec& sizes,
                 TransferStatus* status, TransferUniqueId id);
  void IOEngine::BatchWrite(const MemoryDesc& localSrc, const SizeVec& localOffsets,
                  const MemoryDesc& remoteDest, const SizeVec& remoteOffsets, const SizeVec& sizes,
                  TransferStatus* status, TransferUniqueId id);

New API (Multi-Session)

  void IOEngine::BatchRead(const MemDescVec& localDest, const BatchSizeVec& localOffsets,
                 const MemDescVec& remoteSrc, const BatchSizeVec& remoteOffsets,
                 const BatchSizeVec& sizes, TransferStatusPtrVec& status, TransferUniqueIdVec& ids);
  void IOEngine::BatchWrite(const MemDescVec& localSrc, const BatchSizeVec& localOffsets,
                  const MemDescVec& remoteDest, const BatchSizeVec& remoteOffsets,
                  const BatchSizeVec& sizes, TransferStatusPtrVec& status,
                  TransferUniqueIdVec& ids);

[TianDi101]

@maning00 Thanks, could you please add some unit tests to test transferring over multiple sessions?

[maning00]

@TianDi101 added