Limit history when show_undo_redo=False

[alexcjohnson]

After #724 and plotly/dash-renderer#175, the state history is only relevant to revert, which is used for error recovery so only needs to hold one previous (good) state as described in plotly/dash-renderer#175 (comment). If we simplify the history when the undo/redo toolbar is hidden, we may see a significant performance boost for large and/or frequently-updated apps.

Possibly related: #699, #707

[nicolaskruchten]

If undo/redo has a big perf hit it would be nice to add a parameter for "number of undo/redo steps" even when it's on. And then turning it off would default it to 1.