refactor: name of the feature: `namespace` to `workspace`

[imjuni]

• follow this to use workspace as a single task name in your monorepo project

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (6859ae4) 100.00% compared to head (3cfb9a2) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #112 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 69 69 Lines 781 781 Branches 167 167 ========================================= Hits 781 781 ```

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