API: Add sampler override switching

Allow users to switch the currently overriden samplers via the API
so a restart isn't required to switch the overrides.

Signed-off-by: kingbri <bdashore3@proton.me>

OAI/types/sampler_overrides.py

@@ -0,0 +1,26 @@
+from pydantic import BaseModel, Field
+from typing import Optional
+
+
+class SamplerOverrideSwitchRequest(BaseModel):
+    """Sampler override switch request"""
+
+    preset: Optional[str] = Field(
+        default=None, description="Pass a sampler override preset name"
+    )
+
+    overrides: Optional[dict] = Field(
+        default=None,
+        description=(
+            "Sampling override parent takes in individual keys and overrides."
+            + "Ignored if preset is provided."
+        ),
+        examples=[
+            {
+                "top_p": {
+                    "override": 1.5,
+                    "force": False,
+                }
+            }
+        ],
+    )