feat: add StreamToolCallChecker for react & host multiagent, add ToolChoice for chat model call option

What's Changed

• chore: correct and clear up readme by @shentongmartin in #42
• refactor: gragp & workflow by @meguminnnnnnnnn in #29
• feat: add StreamToolCallChecker to host multi-agent config by @shentongmartin in #40
• feat: optimize FieldMapping init func & optimize convertTo when use '… by @meguminnnnnnnnn in #44
• refactor: chat model tool choice by @N3kox in #37
• feat: fix readme format error by @kuhahalong in #45
• Revert "feat: remove tool choice in model callback input" by @N3kox in #46
• feat: deprecate ToolChoice in model CallbackInput by @N3kox in #47
• feat: remove xxx from retriever comment by @meguminnnnnnnnn in #49
• fix: misspell word by @meguminnnnnnnnn in #50
• feat: add tool choice definition, call options add tools and tool choice by @N3kox in #48
• Fix/readme by @shentongmartin in #51

Features

• add StreamToolCallChecker for react & host multi agent due to some models can't output ToolCall Information in first package
• add ToolChoice & ToolInfo for chat model call option
• adjust Eino's README

Full Changelog: v0.3.7...v0.3.8