classify errors in chatbot

[MaleicAcid]

• add ClassifiedErrors to unified error handling
• add a dev group in pyproject.yaml

try to run translator test but get following errror:

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ERROR: test_single_chunk_translation (tests.test_translate.TestLLMTranslator.test_single_chunk_translation)
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Traceback (most recent call last):
  File "/home/user00/gitspace/openlrc/tests/test_translate.py", line 26, in test_single_chunk_translation
    translation = translator.translate(text, 'en', 'es')[0]
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user00/gitspace/openlrc/openlrc/translate.py", line 190, in translate
    guideline = context_reviewer.build_context(
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user00/gitspace/openlrc/openlrc/agents.py", line 319, in build_context
    resp = self.chatbot.message(messages_list, output_checker=self.validate_prompter.check_format)[0]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user00/gitspace/openlrc/openlrc/chatbot.py", line 190, in message
    results = asyncio.run(
              ^^^^^^^^^^^^
  File "/usr/lib/python3.11/asyncio/runners.py", line 190, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/asyncio/base_events.py", line 653, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/home/user00/gitspace/openlrc/openlrc/chatbot.py", line 156, in _amessage
    results = await asyncio.gather(
              ^^^^^^^^^^^^^^^^^^^^^
  File "/home/user00/gitspace/openlrc/openlrc/chatbot.py", line 260, in _create_achat
    self.update_fee(response)
  File "/home/user00/gitspace/openlrc/openlrc/chatbot.py", line 232, in update_fee
    prompt_tokens = response.usage.prompt_tokens
                    ^^^^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'usage