finish reason error (#1907)

- **Export finish reason error**
- **update docs**
- **more docs**

Author: aaronvg

engine/language_client_python/python_src/baml_py/errors.py

@@ -3,7 +3,11 @@
     BamlClientError,
     BamlInvalidArgumentError,
 )
-from .internal_monkeypatch import BamlValidationError, BamlClientHttpError
+from .internal_monkeypatch import (
+    BamlValidationError,
+    BamlClientHttpError,
+    BamlClientFinishReasonError,
+)
 
 
 __all__ = [
@@ -12,4 +16,5 @@
     "BamlClientHttpError",
     "BamlInvalidArgumentError",
     "BamlValidationError",
+    "BamlClientFinishReasonError",
 ]

fern/03-reference/baml/clients/providers/aws-bedrock.mdx

@@ -16,6 +16,14 @@ client<llm> MyClient {
       max_tokens 100
       temperature 0.7
     }
+    // Pass any other parameters that are model specific, 
+    // like with claude thinking models.
+    additional_model_request_fields {
+      thinking {
+        type "enabled"
+        budget_tokens 1030
+      }
+    }
   }
 }
 ```

fern/03-reference/baml_client/errors/baml-client-finish-reason-error.mdx

@@ -0,0 +1,16 @@
+client<llm> OpenAIWithFinishReasonError {
+  provider openai
+  options {
+    api_key env.OPENAI_API_KEY
+    model "gpt-4"
+    max_tokens 10
+    finish_reason_allow_list ["stop"]
+  }
+}
+
+function TestOpenAIWithFinishReasonError(input: string) -> string {
+  client OpenAIWithFinishReasonError
+  prompt #"
+    {{ _.role("user") }} Write a haiku.
+  "#
+}