python: embedding cancel callback for nomic client dynamic mode (#2214)

Signed-off-by: Jared Van Bortel <jared@nomic.ai>

gpt4all-backend/llmodel_shared.cpp

@@ -270,7 +270,7 @@ void LLModel::generateResponse(std::function<bool(int32_t, const std::string&)>
 
 void LLModel::embed(
     const std::vector<std::string> &texts, float *embeddings, std::optional<std::string> prefix, int dimensionality,
-    size_t *tokenCount, bool doMean, bool atlas
+    size_t *tokenCount, bool doMean, bool atlas, EmbedCancelCallback *cancelCb
 ) {
     (void)texts;
     (void)embeddings;
@@ -279,6 +279,7 @@ void LLModel::embed(
     (void)tokenCount;
     (void)doMean;
     (void)atlas;
+    (void)cancelCb;
     throw std::logic_error(std::string(implementation().modelType()) + " does not support embeddings");
 }