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

[Korayem]

@vikyw89 Thanks for the PR. I was about to start working on OpenRouter as an alternative to OpenAI

But I suggest you split the PR into different ones for easier decision to merge. Currently the Files changed contains a lot line changes to be reviewed. Just to be mindful of @zainhoda's time