feat: add workflow toolkit and runtime support

tools/query_weatcher.yaml

@@ -0,0 +1,21 @@
+name: get_weather
+desc: 查询指定城市实时天气
+params:
+    - name: city
+      type: string
+      required: true
+      description: 城市名称
+env:
+    - WEATHER_API_KEY
+steps:
+    - url: https://api.weather.com/current?q=${param:city}&key=${env:WEATHER_API_KEY}
+      method: GET
+      var:
+          - name: city_name
+            extract: location.name
+          - name: temp
+            extract: current.temp_c
+          - name: condition
+            extract: current.condition.text
+      result: |
+          ${step0:city_name} 当前温度 ${step0:temp}°C，${step0:condition}