MCP client support (#427)

- MCP client service
- Tool request/response schema
- API gateway support for mcp-tool
- Message translation for tool request & response
- Make mcp-tool using configuration service for information
  about where the MCP services are.

trustgraph-base/trustgraph/messaging/translators/tool.py

@@ -0,0 +1,51 @@
+import json
+from typing import Dict, Any, Tuple
+from ...schema import ToolRequest, ToolResponse
+from .base import MessageTranslator
+
+class ToolRequestTranslator(MessageTranslator):
+    """Translator for ToolRequest schema objects"""
+    
+    def to_pulsar(self, data: Dict[str, Any]) -> ToolRequest:
+        # Handle both "name" and "parameters" input keys
+        name = data.get("name", "")
+        if "parameters" in data:
+            parameters = json.dumps(data["parameters"])
+        else:
+            parameters = None
+        
+        return ToolRequest(
+            name = name,
+            parameters = parameters,
+        )
+    
+    def from_pulsar(self, obj: ToolRequest) -> Dict[str, Any]:
+        result = {}
+        
+        if obj.name:
+            result["name"] = obj.name
+        if obj.parameters is not None:
+            result["parameters"] = json.loads(obj.parameters)
+        
+        return result
+
+class ToolResponseTranslator(MessageTranslator):
+    """Translator for ToolResponse schema objects"""
+    
+    def to_pulsar(self, data: Dict[str, Any]) -> ToolResponse:
+        raise NotImplementedError("Response translation to Pulsar not typically needed")
+    
+    def from_pulsar(self, obj: ToolResponse) -> Dict[str, Any]:
+
+        result = {}
+        
+        if obj.text:
+            result["text"] = obj.text
+        if obj.object:
+            result["object"] = json.loads(obj.object)
+        
+        return result
+    
+    def from_response_with_completion(self, obj: ToolResponse) -> Tuple[Dict[str, Any], bool]:
+        """Returns (response_dict, is_final)"""
+        return self.from_pulsar(obj), True