feat: codegen swift

[codecov-commenter]

Codecov Report

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

Project coverage is 44.09%. Comparing base (d861145) to head (5b5a9ce).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #161 +/- ## ======================================= Coverage 44.09% 44.09% ======================================= Files 5 5 Lines 3159 3159 Branches 114 114 ======================================= Hits 1393 1393 Misses 1611 1611 Partials 155 155 ``` | [Flag](https://app.codecov.io/gh/aliyun/darabonba-openapi/pull/161/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aliyun) | Coverage Δ | | |---|---|---| | [golang](https://app.codecov.io/gh/aliyun/darabonba-openapi/pull/161/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aliyun) | `48.54% <ø> (ø)` | | | [python](https://app.codecov.io/gh/aliyun/darabonba-openapi/pull/161/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aliyun) | `35.45% <ø> (ø)` | | | [typescript](https://app.codecov.io/gh/aliyun/darabonba-openapi/pull/161/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aliyun) | `55.98% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aliyun#carryforward-flags-in-the-pull-request-comment) to find out more.

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