til: introduce til_module_create_contexts() variant

checkers::fill_module is presently implemented via creating
n_cpus identical module contexts, each having n_cpus=1.
Establishing a set of cloned per-cpu contexts, allowing threaded
rendering using any fill_module, regardless of if that module
internally implements threaded rendering.

This works fine, but creates some awkwardness for a future where
contexts are registered and discoverable within the stream at
their respective setup's path.  In the checkers::fill_module
case, there would be n_cpus contexts at the same path since they
share the same til_setup_t.  Those need to be dealt with
gracefully, ideally making the clones available to another
potentially clone-needing module (imagine a checkers::fill_module
transitionining to another checkers::fill_module situation, where
the transitioned-to fill_module refers to the context by path, it
should get all the contexts out of the stream as-is)

In this commit I'm adding a more formalized method of creating
multiple contexts from the same set of parameters, in preparation
for a future where module contexts get registered on the stream
at their til_setup_t.path.  By putting the cloned creates behind
the til API it should at least be relatively trivial to get the
on-stream context registration to capture the multiple contexts.

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