Prepare a temp OSS-Fuzz at the beginning of introspector.py (#26)

This automatically clones a temporary `OSS-Fuzz` for users and prepares
it for `introspector.py`.

data_prep/introspector.py

@@ -27,6 +27,7 @@
 
 from data_prep import project_src
 from experiment import benchmark as benchmarklib
+from experiment import oss_fuzz_checkout
 
 TIMEOUT = 10
 INTROSPECTOR_ENDPOINT = 'https://introspector.oss-fuzz.com/api'
@@ -311,6 +312,8 @@ def get_project_funcs(project_name: str) -> Dict[str, List[Dict]]:
   if len(sys.argv) > 2:
     max_num_function = int(sys.argv[2])
 
+  oss_fuzz_checkout.clone_oss_fuzz()
+  oss_fuzz_checkout.postprocess_oss_fuzz()
   benchmarks = populate_benchmarks_using_introspector(sys.argv[1],
                                                       max_num_function)
   if benchmarks: