feat(templater): override sprig default function with guarded alternative

These changes overrides the `default` function provided by sprig with
an alternative to retrieve variable values from variables that might
not have been declared at all.

Referencing a variable in a template that is not declared, will lead
to the underlying templating functionality raising an error, causing
kontemplate to exit.

The override alternative to `default` accepts a second string argument
with the variable name. If the variable in question has not been
declared the first argument's value would be returned, just as the
original `default` function does.

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