Add support for rocJpegDecodeBatched API - part 1 of 2 (#31)

* Add initial support for batch decoding

* Add support for reading and parsing the images in batches and allocating the output buffers

* Add initial support for the rocJpegDecodeBatched API

* use recursive_mutex to allow DecodeBatched and Decode functions called concurrently

* code cleanup

* Add a CTEST for jpegdecodebatched

* modify the help message

* code clean up

[ROCm/rocjpeg commit: c660aeab43]

projects/rocjpeg/samples/jpegDecodeMultiThreads/jpegdecodemultithreads.cpp

@@ -132,7 +132,7 @@ int main(int argc, char **argv) {
     RocJpegUtils rocjpeg_utils;
     std::vector<std::thread> threads;
 
-    RocJpegUtils::ParseCommandLine(input_path, output_file_path, save_images, device_id, rocjpeg_backend, decode_params, &num_threads, argc, argv);
+    RocJpegUtils::ParseCommandLine(input_path, output_file_path, save_images, device_id, rocjpeg_backend, decode_params, &num_threads, nullptr, argc, argv);
     if (!RocJpegUtils::GetFilePaths(input_path, file_paths, is_dir, is_file)) {
         std::cerr << "ERROR: Failed to get input file paths!" << std::endl;
         return EXIT_FAILURE;