vyos.template: T7122: add Jinja2 clever function helper to read vyos.defaults

Add a new category if Jinja2 operands. We already have filters and tests, but
sometimes we would like to call a Python function without and data "|" piped
to it - that's what they call a clever-function.

{{ get_default_port(NAME) }} can be used to retrieve the value from
vyos.defaults.internal_ports[NAME] within Jinja2. We no longer need to extend
the dictionary with arbitrary data retrieved from vyos.defaults, we can now
simply register another clever-function to the Jinja2 backend.

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