refactor weird naming PackageName.getPackageName()

[swissiety]

to getName() which is basically the same as toString() but with getPackageName i would expect the Type again.. which would be weird.

[codecov]

Codecov Report

Patch coverage: 84.61% and project coverage change: -0.03 ⚠️

Comparison is base (889b9dd) 64.51% compared to head (08a21a0) 64.49%.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #646      +/-   ##
=============================================
- Coverage      64.51%   64.49%   -0.03%     
+ Complexity      3310     3309       -1     
=============================================
  Files            311      311              
  Lines          14754    14754              
  Branches        2451     2451              
=============================================
- Hits            9519     9516       -3     
- Misses          4352     4354       +2     
- Partials         883      884       +1     

Impacted Files	Coverage Δ
...sootup/java/core/signatures/ModulePackageName.java	81.81% <50.00%> (ø)
...java/sootup/jimple/parser/JimpleConverterUtil.java	68.54% <50.00%> (ø)
.../main/java/sootup/core/signatures/PackageName.java	78.57% <100.00%> (-6.05%)	⬇️
...utlocation/JrtFileSystemAnalysisInputLocation.java	66.66% <100.00%> (-0.38%)	⬇️
...n/java/sootup/java/core/JavaIdentifierFactory.java	82.90% <100.00%> (ø)
...ain/java/sootup/java/core/types/JavaClassType.java	97.29% <100.00%> (ø)
...in/java/sootup/java/core/views/JavaModuleView.java	79.58% <100.00%> (ø)

... and 1 file with indirect coverage changes

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