add configuration for data upload

Django allows (1) max memory size of uploads to be set and (2) max number of files to be set. We currently use the default values. See: https://docs.djangoproject.com/en/4.2/ref/settings/#std-setting-DATA_UPLOAD_MAX_NUMBER_FILES for more detail.

physionet-django/physionet/settings/base.py

@@ -623,3 +623,7 @@ class StorageTypes:
 
 # minimum number of word needed for research_summary field for Credentialing Model.
 MIN_WORDS_RESEARCH_SUMMARY_CREDENTIALING = config('MIN_WORDS_RESEARCH_SUMMARY_CREDENTIALING', cast=int, default=20)
+
+# Django configuration for file upload (see https://docs.djangoproject.com/en/4.2/ref/settings/)
+DATA_UPLOAD_MAX_NUMBER_FILES = config('DATA_UPLOAD_MAX_NUMBER_FILES', cast=int, default=1000)
+DATA_UPLOAD_MAX_MEMORY_SIZE = config('DATA_UPLOAD_MAX_MEMORY_SIZE', cast=int, default=2621440)