feat(models): Added Executor class

Executor performs HTTP requests:
- Uses httpx for HTTP calls
- Resolves {{variable}} in URLs
- Returns Response with status, body, headers

models/executor.py

@@ -0,0 +1,35 @@
+import httpx
+from .context import Context
+from .itm import RequestModel
+
+
+class Response:
+    def __init__(self, status: int, body: dict, headers: dict):
+        self.status = status
+        self.body = body
+        self.headers = headers
+
+
+class Executor:
+    def __init__(self, context: Context):
+        self.context = context
+
+    def execute(self, request: RequestModel) -> Response:
+        url = self.context.resolve(request.path)
+        if not url.startswith("http"):
+            url = f"{self.context.config.base_url}{url}"
+
+        with httpx.Client() as client:
+            resp = client.request(
+                method=request.method,
+                url=url,
+                headers=request.headers,
+                json=request.body if request.body_type == "json" else None,
+                timeout=request.timeout,
+            )
+
+        return Response(
+            status=resp.status_code,
+            body=resp.json() if resp.headers.get("content-type", "").startswith("application/json") else {},
+            headers=dict(resp.headers),
+        )