Add support for cancel_on_interruption paramater when registering functions.

[DhirajDunani]

When registering functions directly via llm.register_function(), I can specify cancel_on_interruption=False to prevent certain functions from being cancelled when a user interrupts.

However, when using pipecat-flows with FlowsFunctionSchema in node configurations, there's no way to specify this parameter.

[nasimuddin01]

Any update on the issue?

[smokyabdulrahman]

Opened a PR to resolve this issue.