feat: Add items and title to ToolParameter/ToolParamDefinition (#3003)

# What does this PR do?
<!-- Provide a short summary of what this PR does and why. Link to
relevant issues if applicable. -->
Add items and title to ToolParameter/ToolParamDefinition. Adding items
will resolve the issue that occurs with Gemini LLM when an MCP tool has
array-type properties.

<!-- If resolving an issue, uncomment and update the line below -->
<!-- Closes #[issue-number] -->

## Test Plan
<!-- Describe the tests you ran to verify your changes with result
summaries. *Provide clear instructions so the plan can be easily
re-executed.* -->
Unite test cases will be added.

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Kai Wu <kaiwu@meta.com>
Co-authored-by: Ashwin Bharambe <ashwin.bharambe@gmail.com>

docs/static/llama-stack-spec.html

@@ -6783,6 +6783,31 @@
                         "type": "boolean",
                         "default": true
                     },
+                    "items": {
+                        "oneOf": [
+                            {
+                                "type": "null"
+                            },
+                            {
+                                "type": "boolean"
+                            },
+                            {
+                                "type": "number"
+                            },
+                            {
+                                "type": "string"
+                            },
+                            {
+                                "type": "array"
+                            },
+                            {
+                                "type": "object"
+                            }
+                        ]
+                    },
+                    "title": {
+                        "type": "string"
+                    },
                     "default": {
                         "oneOf": [
                             {
@@ -7457,6 +7482,14 @@
                         "default": true,
                         "description": "Whether this parameter is required for tool invocation"
                     },
+                    "items": {
+                        "type": "object",
+                        "description": "Type of the elements when parameter_type is array"
+                    },
+                    "title": {
+                        "type": "string",
+                        "description": "(Optional) Title of the parameter"
+                    },
                     "default": {
                         "oneOf": [
                             {

docs/static/llama-stack-spec.yaml

@@ -4866,6 +4866,16 @@ components:
         required:
           type: boolean
           default: true
+        items:
+          oneOf:
+            - type: 'null'
+            - type: boolean
+            - type: number
+            - type: string
+            - type: array
+            - type: object
+        title:
+          type: string
         default:
           oneOf:
             - type: 'null'
@@ -5403,6 +5413,13 @@ components:
           default: true
           description: >-
             Whether this parameter is required for tool invocation
+        items:
+          type: object
+          description: >-
+            Type of the elements when parameter_type is array
+        title:
+          type: string
+          description: (Optional) Title of the parameter
         default:
           oneOf:
             - type: 'null'