added a few java docs (Sentry, Hub and SentryClient)

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

added a few java docs.

💡 Motivation and Context

we are poor of javadocs.

💚 How did you test it?

📝 Checklist

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

🔮 Next steps

more and more javadocs

[marandaneto]

@bruno-garcia do we need to javadocs the Impl. classes or only the public interfaces?

[bruno-garcia]

@marandaneto Ideally all public types their members.

I'd say at least all public API from Sentry, SentryOptions, SentryClient, Hub, SentryEvent and Scope. Anything else major you'd suggest?

[bruno-garcia]

👍
CI is unhappy somehow

[marandaneto]

CI is unhappy somehow

because of #224 already fixed it

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@6770616). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master     #223   +/-   ##
=========================================
  Coverage          ?   58.17%           
  Complexity        ?      570           
=========================================
  Files             ?       72           
  Lines             ?     2697           
  Branches          ?      238           
=========================================
  Hits              ?     1569           
  Misses            ?     1014           
  Partials          ?      114

Impacted Files	Coverage Δ	Complexity Δ
...ntry-core/src/main/java/io/sentry/core/Sentry.java	0% <0%> (ø)	0 <0> (?)

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