fix missing node postprocessor in CondensePlusContextChatEngine async

* wip

* wip return direct

* fix tests

* fully implement with docs

* more verbose logging

* even more verbose

* more docs

fixes

* add async task stack

* just use asyncio.current_task

* wip

* delay asyncio Lock assignment in dispatcher

* fix async unit tests

* add async_postprocess_nodes and rankgpt test code

* fix typo and rename async functions

* use pytest.mark.asyncio

---------

Co-authored-by: jeffrey <vkefhdl1@gmail.com>

* delegating retriever api if the query engine supports it

* add comments

* address lint errors

* add span_id to Event

* remove raise err in NullHandler

* wip

* modify root dispatcher event enclosing span

* remove *args as we have bound_args now

* add LLMChatInProgressEvent

* add LLMStructuredPredict Eventst

* store span_id before await executions

* add SpanDropEvent with err_str payload

* add event to _achat; flush current_span_id when open_spans is empty

* llm callbacks use root span_id

* add unit tests

* remove print statements

* provide context manager returning a distpatch event partial with correct span id

* move to context manager usage

* fix invocation of cm

* define and use get_dispatch_event method

* remove aim tests

wip

* added node-postprocessors to retriever_tool

* fix linting

---------

Co-authored-by: Izuki Matsuba <imatsuba@omers.com>

* Update llama_parse_json_element.py

Please refer to https://github.com/run-llama/llama_index/issues/12314

 for a detailed explanation of the bug fix.

* cr

---------

Co-authored-by: Haotian Zhang <socool.king@gmail.com>

[ReAct] Deduplicate the two built-in system prompts; Also make it read from a Markdown file (#12307)