changing output format of Kosaraju algorithm

[guru2396]

This PR is for #261.

• Added new fields in SCCResult struct for saving the output as a map.
• Modified Kosaraju algorithm to save output in the map.
• Modified tests

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[codecov]

Codecov Report

Merging #365 (07635df) into master (92fca0a) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #365      +/-   ##
==========================================
- Coverage   97.50%   97.50%   -0.01%     
==========================================
  Files          55       55              
  Lines        9179     9174       -5     
==========================================
- Hits         8950     8945       -5     
  Misses        229      229              

Flag	Coverage Δ
unittests	97.50% <100.00%> (-0.01%)	⬇️

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Files	Coverage Δ
include/CXXGraph/Graph/Graph.hpp	95.58% <100.00%> (ø)
include/CXXGraph/Utility/Typedef.hpp	100.00% <ø> (ø)
test/KosarajuTest.cpp	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

[sbaldu]

Looks good

[guru2396]

One more thing to add. Instead of using edgeSet, the adjacency matrix can be used to populate the nodeSet in getNodeSet() method. This method is used many times in the code, so may be there can be some benefit.