feat: support safe slac

[Gaiejj]

Description

This PR is already complete in terms of implementation accuracy. We will merge it shortly after improving the code style and documentation.

Support Safe SLAC[1] algorithms for Safe Vision tasks in Safety-Gymnasium

[1]: Safe Reinforcement Learning From Pixels Using a Stochastic Latent Representation

Example Demo

https://github.com/PKU-Alignment/omnisafe/assets/108712610/46aa5f2d-63be-4c99-9d68-84eeed2b7da5

Experiment and Performance

• SafetyCarGoal1Vision-v1
• SafetyPointButton1Vision-v1
• SafetyPointGoal1Vision-v1
• SafetyPointGoal2Vision-v1

Motivation and Context

Vision-based safety tasks are of great significance for the safe exploration of agents. The interface for Safe Vision will promote the development of vision-based SafeRL algorithms.

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds core functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation (update in the documentation)

Checklist

Go over all the following points, and put an x in all the boxes that apply. If you are unsure about any of these, don't hesitate to ask. We are here to help!

• [x] I have read the CONTRIBUTION guide. (required)
• [x] My change requires a change to the documentation.
• [x] I have updated the tests accordingly. (required for a bug fix or a new feature)
• [x] I have updated the documentation accordingly.
• [x] I have reformatted the code using make format. (required)
• [x] I have checked the code using make lint. (required)
• [x] I have ensured make test pass. (required)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 27.43056% with 418 lines in your changes are missing coverage. Please review.

Project coverage is 91.63%. Comparing base (93d4975) to head (9fd5fd7). Report is 1 commits behind head on main.

:exclamation: Current head 9fd5fd7 differs from pull request most recent head 277b6e1. Consider uploading reports for the commit 277b6e1 to get more accurate results

Files	Patch %	Lines
omnisafe/common/latent.py	20.92%	121 Missing :warning:
omnisafe/algorithms/off_policy/safe_slac.py	19.67%	98 Missing :warning:
omnisafe/adapter/offpolicy_latent_adapter.py	24.39%	93 Missing :warning:
omnisafe/common/buffer/offpolicy_buffer.py	33.33%	26 Missing :warning:
omnisafe/utils/tools.py	35.00%	26 Missing :warning:
omnisafe/envs/safety_gymnasium_vision_env.py	46.67%	24 Missing :warning:
omnisafe/utils/model.py	40.74%	16 Missing :warning:
omnisafe/common/buffer/base.py	39.13%	14 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #324 +/- ## ========================================== - Coverage 96.83% 91.63% -5.21% ========================================== Files 138 142 +4 Lines 7071 7643 +572 ========================================== + Hits 6847 7003 +156 - Misses 224 640 +416 ```

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