feat: openrouter integration, added additional async methods

[vikyw89]

on vannabase

• async mysql method
• async methods on runsql etc
• openrouter async and streaming

on qdrant

• async client

on openrouter

• new openrouter integration, default set to deepseekv2

on dependencies

• aiomysql

implemented as additional methods, doesn't touch the sync method as not to break existing code

these methods are manually tested on jupyternotebook:

• aconnect my sql
• atrain
• arunsql
• aask

with these optional dependencies:

• openai
• mysql
• qdrant