added javadocs to scope and its dependencies

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

added javadocs to the scope and its dependencies.

💡 Motivation and Context

users may learn directly from code.

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing

🔮 Next steps

[codecov-io]

Codecov Report

Merging #253 into master will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #253   +/-   ##
=========================================
  Coverage     57.26%   57.26%           
  Complexity      576      576           
=========================================
  Files            73       73           
  Lines          2761     2761           
  Branches        234      234           
=========================================
  Hits           1581     1581           
  Misses         1062     1062           
  Partials        118      118

Impacted Files	Coverage Δ	Complexity Δ
...ntry-core/src/main/java/io/sentry/core/Sentry.java	30.76% <ø> (ø)	7 <0> (ø)	⬇️
...core/src/main/java/io/sentry/core/SentryLevel.java	100% <ø> (ø)	1 <0> (ø)	⬇️
...entry-core/src/main/java/io/sentry/core/Scope.java	82.1% <100%> (ø)	29 <0> (ø)	⬇️
...-core/src/main/java/io/sentry/core/Breadcrumb.java	89.09% <100%> (ø)	21 <1> (ø)	⬇️
...re/src/main/java/io/sentry/core/protocol/User.java	95.12% <100%> (ø)	18 <0> (ø)	⬇️

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