All oras commands should use handlers to display command output

[wangxiaoxuan273]

Commands that need handler improvement:

• refactor oras cp to use handlers for command output #1548

• refactor oras push to use handlers for command output #1549

• refactor oras resolve to use handlers for command output #1550

• refactor oras manifest delete to use handlers for command output #1551

• refactor oras blob delete to use handlers for command output #1552

• refactor oras manifest push to use handlers for command output

• refactor oras blob push to use handlers for command output

[qweeah]

Why oras manifest push is excluded?

[wangxiaoxuan273]

Why oras manifest push is excluded?

I wasn't sure if that one needs refactoring. We can add it to this issue.

[qweeah]

If I understand correctly, the goal of this issue is to make all oras commands use handlers to display command output, which means print utilities should not be directly called in command code. In this way, you can search for usages of print utilities in files within $REPO/cmd/oras/root and include all found commands there. E.g. oras manifest push and oras blob push calls PrintStatus and should be included.

[TerryHowe]

#1485 might help set the tone for generalizing handlers between text and ttty