feat(stage): support stage list

[sundy-li]

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Summary

Summary about this PR

MySQL [(none)]> list @named_external_stage PATTERN = 'ontime.*parquet';
+-----------------------+
| file_name             |
+-----------------------+
| ontime_200.parquet    |
| ontime_200_v1.parquet |
+-----------------------+
2 rows in set (2.150 sec)

Changelog

• New Feature

Related Issues

Part of #4104

Test Plan

Unit Tests

Stateless Tests

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[mergify]

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[BohuTANG]

Looks great to me!