feat: Add streaming support for v11 tool format in Mistral parser

Co-authored-by: avigny <47987522+avigny@users.noreply.github.com>
Co-authored-by: aider (anthropic/claude-sonnet-4-20250514) <aider@aider.chat>
Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>
Signed-off-by: Jeff Cook <jeff@jeffcook.io>

Author: 3 people