Support copy from stage

[sundy-li]

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

Summary

Summary about this PR

• Support create/desc/drop internal/external

CREATE STAGE named_external_stage url = 's3://testbucket/admin/data/' credentials=(aws_key_id='minioadmin' aws_secret_key='minioadmin');

• Support copy from stage

copy into ontime200 from '@named_external_stage'  PATTERN = 'ontime.*parquet' FILE_FORMAT = (type = 'PARQUET')

Changelog

• Improvement

Related Issues

Part of #4104

Test Plan

Unit Tests

Stateless Tests

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/databend/databend/9PppuBU3KfXkqCRABxtn7NWCvWWV
✅ Preview: https://databend-git-fork-sundy-li-stage-copy2-databend.vercel.app

[Deployment for 09b726e canceled]

[mergify]

Thanks for the contribution!
I have applied any labels matching special text in your PR Changelog.

Please review the labels and make any necessary changes.

[sundy-li]

Copy from internal stage test is skipped because #4442

[BohuTANG]

There are some errors in the stateless test:

2022-03-15T00:58:18.476058Z ERROR opendal::services::fs::backend: object /home/runner/work/databend/databend/stateless_test_data/31/73/_ss/f44cf14595dc436aa141721f6f7b4fd7 stat: Object { kind: ObjectNotExist, op: "stat", path: "/home/runner/work/databend/databend/stateless_test_data/31/73/_ss/f44cf14595dc436aa141721f6f7b4fd7", source: No such file or directory (os error 2) }   

Not sure this is expected or not?

[BohuTANG]

Cool, we have the named external stage!