Add hyde implementation to pipeline

[Kuangdd01]

I tried this test code, and it worked well.

def _test_hyde():
    llm = OpenAI(
        api_key="",
        model="glm-4-plus",
        api_base="",
        is_chat_model=True,
    )
    from src.easyrag.custom.template import HYDE_PROMPT_MODIFIED_MERGING, HYDE_PROMPT_MODIFIED_V2
    hyde_merging_prompt = PromptTemplate(HYDE_PROMPT_MODIFIED_MERGING)
    hyde_prompt = PromptTemplate(HYDE_PROMPT_MODIFIED_V2)
    hyde_transform_merging = HyDEQueryTransform(
        llm=llm, hyde_prompt=hyde_merging_prompt, include_original=True)
    hyde_transform = HyDEQueryTransform(
        llm=llm, hyde_prompt=hyde_prompt, include_original=True)

    query = "通信是什么？"
    hyde_query = hyde_transform(query)
    retrived_chunk = "通信是指信息的传递。"
    merging_template = f'问题：{hyde_query.query_str},\n可能有效的文档：' \
                       f'{hyde_query.custom_embedding_strs[0]},\n参考上下文：{retrived_chunk}'
    hyde_query_merging = hyde_transform_merging(merging_template)
    import pdb; pdb.set_trace()
    after_merging_query = query + hyde_query_merging.custom_embedding_strs[0]
    print(after_merging_query)