Add enter/exit events which happen on per-beacon level

[agap]

No description provided.

[codecov]

Codecov Report

Merging #41 into master will increase coverage by 0.47%.
The diff coverage is 93.93%.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   92.98%   93.46%   +0.47%     
==========================================
  Files          17       17              
  Lines         442      459      +17     
  Branches       42       44       +2     
==========================================
+ Hits          411      429      +18     
  Misses         23       23              
+ Partials        8        7       -1     

Impacted Files	Coverage Δ
.../src/main/java/aga/android/luch/BeaconScanner.java	87.32% <93.93%> (+2.52%)	⬆️

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