Configurable node/edge attribute aggregation when simplifying graph or consolidating intersections

[gboeing]

This PR:

• adds edge_attr_aggs param to the simplify_graph function to let users specify attribute aggregation functions when merging multiple edge segments together
• adds node_attr_aggs param to the consolidate_intersections function to let users specify attribute aggregation functions when merging multiple nodes together

See also #1127 #1144 #1145 #1117 #1106

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.99%. Comparing base (d614c96) to head (ba66e0e).
Report is 6 commits behind head on v2.

Additional details and impacted files

@@           Coverage Diff           @@
##               v2    #1155   +/-   ##
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  Coverage   97.98%   97.99%           
=======================================
  Files          24       24           
  Lines        2436     2442    +6     
=======================================
+ Hits         2387     2393    +6     
  Misses         49       49           

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[gboeing]

The first pre-release OSMnx v2 beta has been released. Testers needed! See #1123 for details.