Add S3/ObjectStorage Compatibility

[pet1330]

[RaymondCM]

The GridFS and UnGridFS functions https://github.com/RaymondKirk/topic_store/blob/master/src/topic_store/database.py#L100-L122.

Should be replaced with a generic object storage solution to allow the use of buckets/filesystem etc. Should be easy to replace with multiple keys i.e __bucket_data, __local_data, __grid_fs_data etc and manage the retrieval with associated functions like the linked gridfs ones.

[RaymondCM]

Note from the meeting this morning, we could abstract these features out to the core parser function and replace the key, value pairs with key: lazy_load function.