feat: BeforeBreadcrumb

[bruno-garcia]

Callback executed before adding a breadcrumb to the scope.

Docs: https://docs.sentry.io/error-reporting/configuration/?platform=csharp#before-breadcrumb

[codecov-io]

Codecov Report

Merging #64 into master will increase coverage by 0.93%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #64      +/-   ##
============================================
+ Coverage     38.74%   39.68%   +0.93%     
- Complexity      185      192       +7     
============================================
  Files            51       51              
  Lines          1368     1376       +8     
  Branches         78       80       +2     
============================================
+ Hits            530      546      +16     
+ Misses          811      800      -11     
- Partials         27       30       +3

Impacted Files	Coverage Δ	Complexity Δ
sentry-core/src/main/java/io/sentry/core/Hub.java	27.88% <100%> (+9.7%)	8 <0> (+4)	⬆️
...ore/src/main/java/io/sentry/core/SentryClient.java	70.27% <100%> (ø)	9 <0> (ø)	⬇️
...re/src/main/java/io/sentry/core/SentryOptions.java	76% <100%> (+1.53%)	23 <2> (+2)	⬆️
...entry-core/src/main/java/io/sentry/core/Scope.java	68.96% <0%> (+6.89%)	12% <0%> (+1%)	⬆️

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