Add support for Android Gradle Plugin 7.0.0

[moallemi]

Add support for AGP 7.0.0 and drop support for previous versions

[codecov]

Codecov Report

Merging #58 (d8fc850) into master (424e763) will decrease coverage by 6.82%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #58      +/-   ##
============================================
- Coverage     86.82%   80.00%   -6.83%     
+ Complexity       69       66       -3     
============================================
  Files             8        8              
  Lines           167      170       +3     
  Branches         31       32       +1     
============================================
- Hits            145      136       -9     
- Misses            4       15      +11     
- Partials         18       19       +1     

Flag	Coverage Δ
unittests	80.00% <100.00%> (-6.83%)	⬇️

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Impacted Files	Coverage Δ
...advancedbuildversion/AdvancedBuildVersionPlugin.kt	88.23% <100.00%> (+0.73%)	⬆️
...advancedbuildversion/utils/CompatibilityManager.kt	92.00% <100.00%> (+0.69%)	⬆️
...mi/gradle/advancedbuildversion/utils/GitWrapper.kt	33.33% <0.00%> (-66.67%)	⬇️
...buildversion/gradleextensions/VersionCodeConfig.kt	77.41% <0.00%> (-12.91%)	⬇️
...ion/gradleextensions/AdvancedBuildVersionConfig.kt	83.33% <0.00%> (-11.12%)	⬇️

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