Add the ability to "freeze" lineage in place

[davidsharp7]

Currently when inspecting a lineage graph if I click on a dataset node the entire graph is re-created based on that new dataset node, however, a large of critical path analysis is being able to inspect each node element without that automatic re-creation.

A useful addition would perhaps be to add a "freeze" toggle that prevented the graph from being recreated when different elements of the critical path are clicked.