[mcp-server] Expose fuzzy file search in MCP (#2677)

## Summary
Expose a simple fuzzy file search implementation for mcp clients to work
with

## Testing
- [x] Tested locally

codex-rs/mcp-server/tests/suite/mod.rs

@@ -5,6 +5,7 @@ mod codex_message_processor_flow;
 mod codex_tool;
 mod config;
 mod create_conversation;
+mod fuzzy_file_search;
 mod interrupt;
 mod list_resume;
 mod login;