Add support to generate auto fixes using LLM (AI)

[tran-the-lam]

This feature adds support to generate auto fixes for Go scanning findings using LLM (AI). In a first instance, it relies on Gemini API to get a suggestion for a solution. This can be later extended, to integrate also other AI providers.

[tran-the-lam]

Example Output:

[tran-the-lam]

@ccojocar Please review this pr

[ccojocar]

Also after you address the review suggestions, please fix the lint warnings. Thanks

[ccojocar]

Also make sure that all checks are passing. The CI is still failing.

[ccojocar]

There are some issue to fix in the build/tests https://github.com/securego/gosec/actions/runs/10259787997/job/28392108382?pr=1177. Otherwise look good! Thanks

[ccojocar]

Unit tests are failing and it seems related to this change, please have a look at https://github.com/securego/gosec/actions/runs/10264724512/job/28456313532?pr=1177#step:5:98

[tran-the-lam]

@ccojocar Please review and merge.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 47.76119% with 35 lines in your changes missing coverage. Please review.

Project coverage is 69.13%. Comparing base (f33fd4b) to head (f97e82f).

Files	Patch %	Lines
autofix/ai.go	41.50%	30 Missing and 1 partial :warning:
cmd/gosec/main.go	0.00%	4 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1177 +/- ## ========================================== - Coverage 69.52% 69.13% -0.39% ========================================== Files 71 72 +1 Lines 3865 3930 +65 ========================================== + Hits 2687 2717 +30 - Misses 1061 1095 +34 - Partials 117 118 +1 ```

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