Adds integration test for bucket creation

[brunocalza]

Test cases

• Create a bucket and checks if it exists
• Create a bucket with metadata and check if the metadata was created correctly
• Create a bunch o buckets and list them all

This addresses bullets points 1 and 4 of https://www.notion.so/Mainnet-Protocol-Readiness-1badfc9427de8073b074e5889058b640?pvs=4#1badfc9427de80eba174e7681a778292