Provide better support for multiplex graphs

[InterdisciplinaryPhysicsTeam]

Closes #23 .

[coveralls]

Pull Request Test Coverage Report for Build 2939659875

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 190 of 244 (77.87%) changed or added relevant lines in 9 files are covered.
• 8 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+6.6%) to 79.496%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/abstractmultilayerdigraph.jl	17	21	80.95%
src/abstractmultilayerugraph.jl	30	36	83.33%
src/interlayer.jl	0	7	0.0%
src/abstractmultiplexdigraph.jl	40	58	68.97%
src/abstractmultiplexugraph.jl	44	63	69.84%
<!--	Total:	190	244	77.87%	-->

Files with Coverage Reduction	New Missed Lines	%
src/multilayergraph.jl	8	76.79%
<!--	Total:	8		-->

Totals
Change from base Build 2920108464:	6.6%
Covered Lines:	977
Relevant Lines:	1229

---

💛 - Coveralls

[codecov[bot]]

Codecov Report

Merging #24 (99af591) into main (3f6ef48) will increase coverage by 3.31%. The diff coverage is 78.22%.

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
+ Coverage   75.35%   78.66%   +3.31%     
==========================================
  Files          13       18       +5     
  Lines        1067     1242     +175     
==========================================
+ Hits          804      977     +173     
- Misses        263      265       +2     

Impacted Files	Coverage Δ
src/MultilayerGraphs.jl	100.00% <ø> (ø)
src/interlayer.jl	69.85% <0.00%> (-3.80%)	:arrow_down:
src/multilayerdigraph.jl	83.48% <ø> (+4.65%)	:arrow_up:
src/multilayergraph.jl	84.34% <ø> (+4.97%)	:arrow_up:
src/abstractmultiplexdigraph.jl	68.96% <68.96%> (ø)
src/abstractmultiplexugraph.jl	69.84% <69.84%> (ø)
src/abstractmultilayerdigraph.jl	80.95% <80.95%> (ø)
src/abstractmultilayerugraph.jl	83.33% <83.33%> (ø)
src/abstractmultilayergraph.jl	92.63% <100.00%> (+0.60%)	:arrow_up:
src/graphs_extensions.jl	71.69% <100.00%> (+5.03%)	:arrow_up:
... and 7 more

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