Module import doesn't work when using pip install llama-cpp-python --target="dir"

该 issue 位于 llama_cpp/llama.py 第 26-27 行，在使用 --target 安装时 import 会失败。检查模块结构，以了解正确的 import 路径。将 package 使用 --target 安装到临时目录中，并验证 import 能够正常工作，以测试该修复。检查代码库中是否还有其他类似的 import 语句可能需要进行相同的更改。

When using the latest update with how I've setup my embedded install, I ran into this issue:

No module named 'llama_cpp.llama_chat_format'
Traceback (most recent call last):
  File "Z:\Anyboty_Client\llamacppClient.py", line 252, in <module>
    llama_cpp = importlib.import_module(llama_module_dir, package="llama_cpp") # Import the llama module from the llama-cpp-python module
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "Z:\Anyboty_Client\PythonFiles\llama_cpp_versions\12_1\ggufv2\windows10\llama_cpp\__init__.py", line 2, in <module>
    from .llama import *
  File "Z:\Anyboty_Client\PythonFiles\llama_cpp_versions\12_1\ggufv2\windows10\llama_cpp\llama.py", line 27, in <module>
    import llama_cpp.llama_chat_format as llama_chat_format
ModuleNotFoundError: No module named 'llama_cpp.llama_chat_format'

I resolved the issue in my specific setup by changing this:
https://github.com/abetlen/llama-cpp-python/blob/01846a76b980224609ac8b69c8eb3f5785816752/llama_cpp/llama.py#L26-L27

To this:

from . import llama_cpp
from . import llama_chat_format

And while I think this is probably a fine solution, not 100% sure. So thought I'd just bring it to y'alls attention and let you fix it properly.