feat: add a default timeout to the session

Close #80

Signed-off-by: Frost Ming <me@frostming.com>

src/unearth/session.py

@@ -113,6 +113,7 @@ def __init__(
         retries: int = DEFAULT_MAX_RETRIES,
         trusted_hosts: Iterable[str] = (),
         ca_certificates: Path | None = None,
+        timeout: float | tuple[float, float] | urllib3.Timeout = 10,
     ) -> None:
         super().__init__()
 
@@ -130,6 +131,7 @@ def __init__(
         self.mount("http://", self._insecure_adapter)
         self.mount("file://", LocalFSAdapter())
 
+        self.timeout = timeout
         self._trusted_host_ports: set[tuple[str, int | None]] = set()
 
         for host in trusted_hosts:
@@ -139,6 +141,11 @@ def __init__(
         if ca_certificates is not None:
             self.set_ca_certificates(ca_certificates)
 
+    def send(self, request: PreparedRequest, **kwargs: Any) -> Response:
+        if kwargs.get("timeout") is None:
+            kwargs["timeout"] = self.timeout
+        return super().send(request, **kwargs)
+
     def set_ca_certificates(self, cert_file: Path):
         """
         Set one or multiple certificate authorities which sign the