fix(cli): serverless ctx mock pkg move bug

[woorui]

Description

1. Move MockContext back to serverless/mock package.
2. Change function signature from ReadLLMFunctionCall(fnCall any) error to ReadLLMFunctionCall() (*ai.FunctionCall, error), This can avoid type missing.

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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **yomo** | ⬜️ Ignored ([Inspect](https://vercel.com/yomorun/yomo/AdP3wf7jKZqWLCHFBqJHST5vHcYL)) | [Visit Preview](https://yomo-git-fix-mock-ctx-yomorun.vercel.app) | | May 29, 2024 11:31am |

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 64.75%. Comparing base (5064d07) to head (fd5a7bb).

Files	Patch %	Lines
ai/openai.go	66.66%	0 Missing and 1 partial :warning:
pkg/bridge/ai/service.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #827 +/- ## ========================================== + Coverage 64.34% 64.75% +0.40% ========================================== Files 45 45 Lines 2614 2613 -1 ========================================== + Hits 1682 1692 +10 + Misses 821 808 -13 - Partials 111 113 +2 ```

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[fanweixiao]

great job