til_stream: introduce on-stream registered contexts

In order for modules like rkt to be able to do integrated
transitions, there must be a way for discovering existing module
contexts by path and using them for rendering in new
compositions.

This is a first stab at something along those lines.  The whole
multiple contexts at the same path pattern has been partially
handled in this implementation, but I think it will just be going
away and checkers::fill_module refactored to not do that.

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