♻️ refactor LoRARequest based on upstream

[prashantgupta24]

Changes need to be done based on this: vllm-project/vllm#6234

ERROR 07-31 22:37:30 async_llm_engine.py:56] UnboundLocalError: cannot access local variable 'lora_path' where it is not associated with a value
Exception in callback _log_task_completion(error_callback=<bound method...7f8825413c10>>)(<Task finishe...ith a value")>) at /home/develop/.conda/envs/vllm/lib/python3.11/site-packages/vllm/engine/async_llm_engine.py:36
handle: <Handle _log_task_completion(error_callback=<bound method...7f8825413c10>>)(<Task finishe...ith a value")>) at /home/develop/.conda/envs/vllm/lib/python3.11/site-packages/vllm/engine/async_llm_engine.py:36>
Traceback (most recent call last):
  File "/home/develop/.conda/envs/vllm/lib/python3.11/site-packages/vllm/lora/worker_manager.py", line 93, in _load_adapter
    lora_path = get_adapter_absolute_path(lora_request.lora_path)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/develop/.conda/envs/vllm/lib/python3.11/site-packages/vllm/lora/utils.py", line 136, in get_adapter_absolute_path
    if lora_path.startswith('~'):
       ^^^^^^^^^^^^^^^^^^^^
AttributeError: 'PosixPath' object has no attribute 'startswith'

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 61.29%. Comparing base (47869cc) to head (efa37f9).
Report is 6 commits behind head on main.

Files	Patch %	Lines
src/vllm_tgis_adapter/grpc/adapters.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #74   +/-   ##
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  Coverage   61.29%   61.29%           
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  Files          20       20           
  Lines        1186     1186           
  Branches      210      210           
=======================================
  Hits          727      727           
  Misses        383      383           
  Partials       76       76           

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