feat: Implement the 'max_tool_calls' parameter for the Responses API (#4062)

# Problem
Responses API uses max_tool_calls parameter to limit the number of tool
calls that can be generated in a response. Currently, LLS implementation
of the Responses API does not support this parameter.

# What does this PR do?
This pull request adds the max_tool_calls field to the response object
definition and updates the inline provider. it also ensures that:

- the total number of calls to built-in and mcp tools do not exceed
max_tool_calls
- an error is thrown if max_tool_calls < 1 (behavior seen with the
OpenAI Responses API, but we can change this if needed)

Closes #[3563](https://github.com/llamastack/llama-stack/issues/3563)

## Test Plan
- Tested manually for change in model response w.r.t supplied
max_tool_calls field.
- Added integration tests to test invalid max_tool_calls parameter.
- Added integration tests to check max_tool_calls parameter with
built-in and function tools.
- Added integration tests to check max_tool_calls parameter in the
returned response object.
- Recorded OpenAI Responses API behavior using a sample script:
https://github.com/s-akhtar-baig/llama-stack-examples/blob/main/responses/src/max_tool_calls.py

Co-authored-by: Ashwin Bharambe <ashwin.bharambe@gmail.com>

client-sdks/stainless/openapi.yml

@@ -6626,6 +6626,11 @@ components:
           type: string
           description: >-
             (Optional) System message inserted into the model's context
+        max_tool_calls:
+          type: integer
+          description: >-
+            (Optional) Max number of total calls to built-in tools that can be processed
+            in a response
         input:
           type: array
           items:
@@ -6984,6 +6989,11 @@ components:
             (Optional) Additional fields to include in the response.
         max_infer_iters:
           type: integer
+        max_tool_calls:
+          type: integer
+          description: >-
+            (Optional) Max number of total calls to built-in tools that can be processed
+            in a response.
       additionalProperties: false
       required:
         - input
@@ -7065,6 +7075,11 @@ components:
           type: string
           description: >-
             (Optional) System message inserted into the model's context
+        max_tool_calls:
+          type: integer
+          description: >-
+            (Optional) Max number of total calls to built-in tools that can be processed
+            in a response
       additionalProperties: false
       required:
         - created_at