implement call graph diff

[sahilagichani14]

1. Have to implement find differences when provided entry points.
2. Have to write test cases as well

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 28 lines in your changes missing coverage. Please review.

Project coverage is 70.05%. Comparing base (482f23b) to head (5e927ea).
Report is 6 commits behind head on develop.

Files	Patch %	Lines
...ain/java/sootup/callgraph/CallGraphDifference.java	0.00%	28 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #976      +/-   ##
=============================================
- Coverage      70.18%   70.05%   -0.13%     
- Complexity      4129     4130       +1     
=============================================
  Files            315      316       +1     
  Lines          15588    15615      +27     
  Branches        2672     2674       +2     
=============================================
- Hits           10940    10939       -1     
- Misses          3761     3789      +28     
  Partials         887      887              

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[swissiety]

👍