Murko: Investigate ways of storing image data in redis

As of https://github.com/DiamondLightSource/dodal/pull/809 we store image data as jpeg bytes. However, we could use something better optimised for binary like https://redis.io/docs/latest/develop/data-types/bitfields/

We should evaluate based on minimising the storage requirements on the DB but without adding the need for any complex code for storing/retrieving (e.g. should still be possible in a couple of lines)

## Acceptance Criteria
- The above are tried on the database and evaluated