oli: implement `oli cp`(`ocp`)

[knight42]

This is a separate issue to track the implementation of oli cp.

Related #422 RFC

oli cp enables users to transfer data between different storage services seamlessly, for instance:

• Upload directory to s3: oli cp -r dir s3://path/
• Download files from azblob: oli cp azblob://path/books.csv /tmp/books.csv

Tasks

• [x] Copy a single file between different storage services:
  • #675
  • #1706
  • #1717
• [ ] Copy directory recursively(oli cp -r)
• [ ] TBD

[Xuanwo]

Maybe we need ols / oli ls first before we have ocp -r?

[knight42]

Maybe we need ols / oli ls first before we have ocp -r?

Exactly. cp -r requires listing files with a particular prefix