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-flow/trustgraph/gateway/dispatch/manager.py

@@ -17,7 +17,7 @@ from . document_rag import DocumentRagRequestor
 from . triples_query import TriplesQueryRequestor
 from . embeddings import EmbeddingsRequestor
 from . graph_embeddings_query import GraphEmbeddingsQueryRequestor
-from . prompt import PromptRequestor
+from . mcp_tool import McpToolRequestor
 from . text_load import TextLoad
 from . document_load import DocumentLoad
 
@@ -40,6 +40,7 @@ request_response_dispatchers = {
     "agent": AgentRequestor,
     "text-completion": TextCompletionRequestor,
     "prompt": PromptRequestor,
+    "mcp-tool": McpToolRequestor,
     "graph-rag": GraphRagRequestor,
     "document-rag": DocumentRagRequestor,
     "embeddings": EmbeddingsRequestor,

trustgraph-flow/trustgraph/gateway/dispatch/mcp_tool.py

@@ -0,0 +1,32 @@
+
+from ... schema import ToolRequest, ToolResponse
+from ... messaging import TranslatorRegistry
+
+from . requestor import ServiceRequestor
+
+class McpToolRequestor(ServiceRequestor):
+    def __init__(
+            self, pulsar_client, request_queue, response_queue, timeout,
+            consumer, subscriber,
+    ):
+
+        super(McpToolRequestor, self).__init__(
+            pulsar_client=pulsar_client,
+            request_queue=request_queue,
+            response_queue=response_queue,
+            request_schema=ToolRequest,
+            response_schema=ToolResponse,
+            subscription = subscriber,
+            consumer_name = consumer,
+            timeout=timeout,
+        )
+
+        self.request_translator = TranslatorRegistry.get_request_translator("tool")
+        self.response_translator = TranslatorRegistry.get_response_translator("tool")
+
+    def to_request(self, body):
+        return self.request_translator.to_pulsar(body)
+
+    def from_response(self, message):
+        return self.response_translator.from_response_with_completion(message)
+