Ensure that replacing model reconnects signals on new model

[philippjfr]

In #8594 we discovered that there doesn't seem to be any mechanism for signals to be reconnected when a model is replaced on another model. For example when replacing the glyph on a GlyphRenderer or the tile_source on a TileRenderer, the renderer should unsubscribe to events on the old model and re-subscribe to any change events on the model but there doesn't seem to be such a mechanism at the moment (unless @bryevdv and I missed something).

It would be nice if a property could handle this automatically by discovering the signals connected to the old model and then setting up those same signals for the model its being replaced with but I know nothing about the feasibility of such a mechanism.