feat(tools): support Tool calls in the API (#1715)

* feat(tools): support Tools in the API

Co-authored-by: =?UTF-8?q?Stephan=20A=C3=9Fmus?= <stephan.assmus@sap.com>

* feat(tools): support function streaming

* Adhere to new return types when using tools instead of functions

* Keep backward compatibility with function calling

* Evaluate function names in chat templates

* Disable recovery with --debug

* Correctly stream out the entire result

* Detect when llm chooses to reply and to not perform any action in SSE

* Feedback from code review

---------

Co-authored-by: =?UTF-8?q?Stephan=20A=C3=9Fmus?= <stephan.assmus@sap.com>

pkg/model/loader.go

@@ -33,6 +33,7 @@ type ChatMessageTemplateData struct {
 	SystemPrompt string
 	Role         string
 	RoleName     string
+	FunctionName string
 	Content      string
 	MessageIndex int
 }