Create cache interface to store frequently accessed I/O bound data

After https://github.com/lablup/backend.ai/issues/1911 is resolved, we need to think about implementing cache interface to store frequently accessed, I/O bound datas. API responses from Harbor API will fall into this case. Interface must be designed in a way to utilize heterogeneous cache backends, but for now let's just think of using only one cache backend, redis.

JIRA Issue: BA-144