Add error ID constant for arrow:io:ipc:EndOfStream.

Author: kevingurney

matlab/src/cpp/arrow/matlab/error/error.h

@@ -250,5 +250,6 @@ static const char* IPC_RECORD_BATCH_READER_OPEN_FAILED =
 static const char* IPC_RECORD_BATCH_READ_INVALID_INDEX = "arrow:io:ipc:InvalidIndex";
 static const char* IPC_RECORD_BATCH_READ_FAILED = "arrow:io:ipc:ReadFailed";
 static const char* IPC_TABLE_READ_FAILED = "arrow:io:ipc:TableReadFailed";
+static const char* IPC_END_OF_STREAM = "arrow:io:ipc:EndOfStream";
 
 }  // namespace arrow::matlab::error

matlab/src/cpp/arrow/matlab/io/ipc/proxy/record_batch_stream_reader.cc

@@ -105,8 +105,8 @@ void RecordBatchStreamReader::readRecordBatch(
   // signalling the end of the stream.
   if (!nextRecordBatch) {
     context.error =
-        Error{"arrow:io:ipc:EndOfStream",
-              "Reached end of Arrow IPC Stream. No more record batches to read."};
+        Error{error::IPC_END_OF_STREAM,
+	    "Reached end of Arrow IPC Stream. No more record batches to read."};
     return;
   }
   auto record_batch_proxy = std::make_shared<RecordBatchProxy>(nextRecordBatch);