feat: agent parallel tool calling

[mhordynski]

Feature description

With parallel tool calling, LLMs will be able to call multiple tools in single turn of interaction with Ragbits agent.

For example:

• model needs to read 3 files
• model includes all 3 tool calls in a single response
• ragbits executes all tools in parallel
• results are sent back in one go

Motivation

It is massive improvement in latency and token usage.

Additional context

https://platform.openai.com/docs/guides/function-calling/parallel-function-calling#parallel-function-calling
https://blog.continue.dev/parallel-tool-calling/