Add OxiAdapter for enhanced HTTP request handling in OxiAPI

- Introduced a new `OxiAdapter` class that extends `HTTPAdapter` to manage timeouts and retries for HTTP requests.
- Integrated the `OxiAdapter` into the `OxiAPI` class, setting a default timeout and enabling retry logic for both HTTP and HTTPS requests.

oxi/adapter.py

@@ -0,0 +1,21 @@
+from typing import Optional
+from requests.adapters import HTTPAdapter
+from urllib3.util import Retry
+
+
+class OxiAdapter(HTTPAdapter):
+    def __init__(
+        self,
+        timeout: Optional[int] = None,
+        max_retries: int = 3,
+        *args,
+        **kwargs,
+    ):
+        self.timeout = timeout
+        retry = Retry(total=max_retries, backoff_factor=0.3)
+        super().__init__(*args, max_retries=retry, **kwargs)
+
+    def send(self, request, **kwargs):
+        if kwargs.get("timeout") is None:
+            kwargs["timeout"] = self.timeout
+        return super().send(request, **kwargs)