implement llama 2 using Tensorflow
https://github.com/leondgarse/keras_cv_attention_models#llama2
### Issue type

Feature Request

### Have you reproduced the bug with TensorFlow Nightly?

No

### Source

source

### TensorFlow version

tf 2.8

### Custom code

No

### OS platform and distribution

_No response_

### Mobile device

_No response_

### Python version

_No response_

### Bazel version

_No response_

### GCC/compiler version

_No response_

### CUDA/cuDNN version

_No response_

### GPU model and memory

_No response_

### Current behavior?

-

### Standalone code to reproduce the issue

```shell
-
```


### Relevant log output

```shell
-
```
