1. Add middleware to record the accepted blob size for stream blob
upload.
2. Add middleware to create blob and associate it with project after blob upload
complete.
3. Add middleware to sync blobs, create blob for manifest and associate blobs
with the manifest after put manifest.
4. Add middleware to associate blob with project after mount blob.
5. Cleanup associations for the project when artifact deleted.
Signed-off-by: He Weiwei <hweiwei@vmware.com>
