feat: addBreadcrumb overloads

[bruno-garcia]

Common use case is: Sentry.addBreadcrumb("bla");

Or, also used for the guide: Sentry.addBreadcrumb(activity.getComponentName().flattenToShortString() + "started", "activity");

[codecov-io]

Codecov Report

Merging #198 into master will decrease coverage by 0.06%.
The diff coverage is 40%.

@@             Coverage Diff              @@
##             master     #198      +/-   ##
============================================
- Coverage     58.01%   57.94%   -0.07%     
- Complexity      546      547       +1     
============================================
  Files            72       72              
  Lines          2601     2611      +10     
  Branches        227      227              
============================================
+ Hits           1509     1513       +4     
- Misses          975      981       +6     
  Partials        117      117

Impacted Files	Coverage Δ	Complexity Δ
...ntry-core/src/main/java/io/sentry/core/Sentry.java	0% <0%> (ø)	0 <0> (ø)	⬇️
sentry-core/src/main/java/io/sentry/core/IHub.java	81.81% <66.66%> (-18.19%)	5 <1> (+1)

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