feat: Add new Mistral AI chat models (#3523)

Adds MAGISTRAL_MEDIUM, MISTRAL_MEDIUM, MAGISTRAL_SMALL, and DEVSTRAL_SMALL to the available chat models.

Fixes: #3523

Signed-off-by: Alexandros Pappas <apappascs@gmail.com>
(cherry picked from commit 6ef15bd)

Author: apappascs

models/spring-ai-mistral-ai/src/main/java/org/springframework/ai/mistralai/api/MistralAiApi.java

@@ -280,12 +280,16 @@ public enum ChatModel implements ChatModelDescription {
 
 		// @formatter:off
 		// Premier Models
+		MAGISTRAL_MEDIUM("magistral-medium-latest"),
+		MISTRAL_MEDIUM("mistral-medium-latest"),
 		CODESTRAL("codestral-latest"),
 		LARGE("mistral-large-latest"),
 		PIXTRAL_LARGE("pixtral-large-latest"),
 		MINISTRAL_3B_LATEST("ministral-3b-latest"),
 		MINISTRAL_8B_LATEST("ministral-8b-latest"),
 		// Free Models
+		MAGISTRAL_SMALL("magistral-small-latest"),
+		DEVSTRAL_SMALL("devstral-small-latest"),
 		SMALL("mistral-small-latest"),
 		PIXTRAL("pixtral-12b-2409"),
 		// Free Models - Research