Add openai store parameter support (#967)

* Add support for openai store param

See `store` param here: https://platform.openai.com/docs/api-reference/chat/create#chat-create-store

* test store param

Author: ajsharp

lib/langchain/llm/parameters/chat.rb

@@ -30,6 +30,7 @@ class Chat < SimpleDelegator
       presence_penalty: {}, # Range: [-2, 2]
       repetition_penalty: {}, # Range: (0, 2]
       seed: {}, # OpenAI only
+      store: {}, # store messages with OpenAI
 
       # Function-calling
       tools: {default: []},

spec/langchain/llm/parameters/chat_spec.rb

@@ -21,6 +21,7 @@
       presence_penalty: 1,
       repetition_penalty: 1,
       seed: 1,
+      store: false,
       tools: [{type: "function", function: {name: "Temp", parameters: {substance: "H20"}}}],
       tool_choice: "auto",
       logit_bias: {"2435": -100, "640": -100}
@@ -36,7 +37,7 @@
 
   context "delegations" do
     it "filters parameters to those provided" do
-      params_with_extras = valid_params.merge(blah: 1, beep: "beep", boop: "boop")
+      params_with_extras = valid_params.merge(blah: 1, beep: "beep", boop: "boop", store: true)
       chat_params = described_class.new
       chat_params.alias_field(:max_tokens, as: :max_tokens_to_sample)
       expect(chat_params.to_params(params_with_extras)).to match(
@@ -55,6 +56,7 @@
         presence_penalty: 1,
         repetition_penalty: 1,
         seed: 1,
+        store: true,
         tools: [{type: "function", function: {name: "Temp", parameters: {substance: "H20"}}}],
         tool_choice: "auto",
         logit_bias: {"2435": -100, "640": -100}
@@ -69,4 +71,18 @@
       expect(chat_params.to_params(valid_params)[:max_tokens]).to eq(100)
     end
   end
+
+  context "store parameter" do
+    it "passes store parameter to to_params" do
+      chat_params = described_class.new
+      params = chat_params.to_params(store: true)
+      expect(params[:store]).to eq(true)
+    end
+
+    it "defaults to nil" do
+      chat_params = described_class.new
+      params = chat_params.to_params({})
+      expect(params[:store]).to be_nil
+    end
+  end
 end