Clean up

[stecrotti]

• Separate file for AbstractIndexedDiGraph
• Get rid of dependency on Reexport
• Prefer using over import

[codecov]

Codecov Report

Attention: Patch coverage is 79.48718% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 84.09%. Comparing base (a43ee1a) to head (b4c6323).

Files	Patch %	Lines
src/abstractindexedgraph.jl	57.14%	3 Missing ⚠️
src/algorithms/dijkstra.jl	33.33%	2 Missing ⚠️
src/indexedgraph.jl	71.42%	2 Missing ⚠️
src/indexeddigraph.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #30   +/-   ##
=======================================
  Coverage   84.09%   84.09%           
=======================================
  Files           8        9    +1     
  Lines         352      352           
=======================================
  Hits          296      296           
  Misses         56       56           

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