[FEATURE] as a user, I want to specify exactly which tools I expose to my MCP client

Maybe I want to give my MCP client / LLM access to perform certain **read** actions, but not **delete**. So instead of exposing all available tools for a given app, I want to enable / disable exactly which tools are exposed.

The story here is relevant for both consumers who are using Pipedream's hosted servers at mcp.pipedream.com and for devs who are self-hosting Pipedream's server from the [reference implementation](https://github.com/PipedreamHQ/pipedream/tree/master/modelcontextprotocol).