do not add automatic and empty sensor breadcrumbs

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

do not add automatic and empty sensor breadcrumbs

💡 Motivation and Context

inspired by #400

💚 How did you test it?

ran it

📝 Checklist

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

🔮 Next steps

find out how to avoid @Ignore test, tried mocking, reflection, hacking private-package but still SensorEvent.values is always null, maybe because of UnsupportedAppUsage in the ctor.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@4648425). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #401   +/-   ##
=========================================
  Coverage          ?   59.84%           
  Complexity        ?      790           
=========================================
  Files             ?       89           
  Lines             ?     3621           
  Branches          ?      350           
=========================================
  Hits              ?     2167           
  Misses            ?     1302           
  Partials          ?      152           

Impacted Files	Coverage Δ	Complexity Δ
...core/src/main/java/io/sentry/core/SentryEvent.java	69.91% <0.00%> (ø)	54.00% <0.00%> (?%)
...rc/main/java/io/sentry/core/protocol/Contexts.java	4.76% <0.00%> (ø)	1.00% <0.00%> (?%)
.../src/main/java/io/sentry/core/SendCachedEvent.java	59.09% <0.00%> (ø)	8.00% <0.00%> (?%)
...re/src/main/java/io/sentry/core/SentryOptions.java	78.80% <0.00%> (ø)	70.00% <0.00%> (?%)
...try-core/src/main/java/io/sentry/core/Session.java	92.59% <0.00%> (ø)	28.00% <0.00%> (?%)
...ore/src/main/java/io/sentry/core/SentryValues.java	100.00% <0.00%> (ø)	3.00% <0.00%> (?%)
...rc/main/java/io/sentry/core/SynchronizedQueue.java	18.18% <0.00%> (ø)	3.00% <0.00%> (?%)
...in/java/io/sentry/core/hints/SessionStartHint.java	100.00% <0.00%> (ø)	1.00% <0.00%> (?%)
...e/src/main/java/io/sentry/core/NoOpSerializer.java	50.00% <0.00%> (ø)	4.00% <0.00%> (?%)
...main/java/io/sentry/core/util/CollectionUtils.java	14.28% <0.00%> (ø)	1.00% <0.00%> (?%)
... and 79 more

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