feat(models): Added RequestModel

RequestModel consists of http response data
class RequestModel:
    method: str     # http method
    path: str       # url path
    headers: dict   # type of info to send
    body: dict      # request body data
    timeout: int    # timeout

models/itm.py

@@ -1,3 +1,13 @@
+class RequestModel(BaseModel):
+    method: str = "GET"
+    path: str = "/"
+    headers: dict[str, str] = {}
+    query: dict[str, str] = {}
+    body: dict[str, Any] | str | None = None
+    body_type: str = "json"
+    timeout: int = 30
+
+
 class StepModel(BaseModel):
     name: str
     request: RequestModel