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Is your feature request related to a problem?

Describe the feature you'd like

In order to make the workflow more powerful, it is necessary to add the MCP call node.

For the use of MCP nodes:

1. Model execution that supports Function Calling can be selected.
2. You can choose a normal model, carry out multiple rounds of dialogue, and let the model return to the tool that needs to be called for circular answers.

For the selection of tools within MCP nodes source:

1. It can be another MCP Server.
2. It can be some built-in tools, such as getting the current time and date. (This part needs to be considered and discussed)

Describe implementation you've considered

No response

Documentation, adoption, use case

Additional information

No response