Optimize `odgi positon` for very large number of graph queries

[cgroza]

One application of odgi position is to lift graph positions to all paths in the graph.
This is particularly useful when trying to relate a graph feature to original assemblies.
Some features, such as CpGs, are very numerous, with millions of instances in the whole graph.

While the current implementation has this function (odgi position -G -R) it is slow for a large number of queries.

Please consider optimizing odgi position to handle this use case.