Add unhandled exception scenarios

[fractalwrench]

Adds scenarios for:

• Unhandled exception thrown from Java
• Unhandled exception thrown from Kotlin

[coveralls]

Pull Request Test Coverage Report for Build 1113

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• 15 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.4%) to 70.735%

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Files with Coverage Reduction	New Missed Lines	%
sdk/src/main/java/com/bugsnag/android/DeviceData.java	2	77.44%
sdk/src/main/java/com/bugsnag/android/Client.java	3	52.58%
sdk/src/main/java/com/bugsnag/android/SessionTracker.java	10	54.62%

Totals
Change from base Build 1101:	-0.4%
Covered Lines:	1762
Relevant Lines:	2491

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💛 - Coveralls