make optional args keyword-only

[gboeing]

This PR:

• makes optional function parameters keyword-only throughout package
• makes dist function parameters required rather than optional throughout package
• renames truncate.truncate_graph_dist's max_dist argument to dist for consistency
• removes unnecessary check_remark param from _http._retrieve_from_cache function

See also #1106

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e3491c1) 97.94% compared to head (65d2bf6) 97.93%.

Additional details and impacted files

@@            Coverage Diff             @@
##               v2    #1134      +/-   ##
==========================================
- Coverage   97.94%   97.93%   -0.01%     
==========================================
  Files          25       25              
  Lines        2428     2427       -1     
==========================================
- Hits         2378     2377       -1     
  Misses         50       50              

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[gboeing]

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