types: expose fallbackRouter in ManhattanRouterArguments #2346
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Description
The manhattan router has an undocumented fallbackRouter option that defaults to "orthogonal". This PR exposes the option in ManhattanRouterArguments so it can be used by consumers and adds documentation for it.
In our app, we found it useful to provide a fallbackRouter that retries manhattan with more relaxed options before falling back to orthogonal. E.g. first manhattan tries with restricted start/end directions, while the second one uses all possible start/end directions.