tools: refactor tool call parsing and enable streaming (#10415)

tools/testdata/llama3.2.gotmpl

@@ -0,0 +1,44 @@
+<|start_header_id|>system<|end_header_id|>
+
+Cutting Knowledge Date: December 2023
+
+{{ if .System }}{{ .System }}
+{{- end }}
+{{- if .Tools }}When you receive a tool call response, use the output to format an answer to the orginal user question.
+
+You are a helpful assistant with tool calling capabilities.
+{{- end }}<|eot_id|>
+{{- range $i, $_ := .Messages }}
+{{- $last := eq (len (slice $.Messages $i)) 1 }}
+{{- if eq .Role "user" }}<|start_header_id|>user<|end_header_id|>
+{{- if and $.Tools $last }}
+
+Given the following functions, please respond with a JSON for a function call with its proper arguments that best answers the given prompt.
+
+Respond in the format {"name": function name, "parameters": dictionary of argument name and its value}. Do not use variables.
+
+{{ range $.Tools }}
+{{- . }}
+{{ end }}
+{{ .Content }}<|eot_id|>
+{{- else }}
+
+{{ .Content }}<|eot_id|>
+{{- end }}{{ if $last }}<|start_header_id|>assistant<|end_header_id|>
+
+{{ end }}
+{{- else if eq .Role "assistant" }}<|start_header_id|>assistant<|end_header_id|>
+{{- if .ToolCalls }}
+{{ range .ToolCalls }}
+{"name": "{{ .Function.Name }}", "parameters": {{ .Function.Arguments }}}{{ end }}
+{{- else }}
+
+{{ .Content }}
+{{- end }}{{ if not $last }}<|eot_id|>{{ end }}
+{{- else if eq .Role "tool" }}<|start_header_id|>ipython<|end_header_id|>
+
+{{ .Content }}<|eot_id|>{{ if $last }}<|start_header_id|>assistant<|end_header_id|>
+
+{{ end }}
+{{- end }}
+{{- end }}