opt in and out to auto-init SDK

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

Added the option via Manifest conf. to disable the auto-init of the Sentry SDK, so before fully initing the SDK we check this flag and don't do anything, the user may init. using a custom Application class.

💡 Motivation and Context

the user may want to init. the SDK by code and pass custom parameters based on buildType/flavors and so on.

💚 How did you test it?

Mocking the manifest value and unit testing.

📝 Checklist

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

🔮 Next steps

This should be written in the setup documentation

[codecov-io]

Codecov Report

Merging #30 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #30   +/-   ##
=========================================
  Coverage     13.61%   13.61%           
  Complexity       66       66           
=========================================
  Files            36       36           
  Lines           764      764           
  Branches         18       18           
=========================================
  Hits            104      104           
  Misses          658      658           
  Partials          2        2

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