Populate task inputs for BugsnagUploadJsSourceMapTask

[fractalwrench]

Goal

Populates the task inputs for the BugsnagUploadJsSourceMapTask. This does not invoke the bugsnag-source-maps CLI tool yet so no source maps are generated, but the command line arguments supplied should now be in their final state.

Changeset

• Added additional task inputs which are part of the command line invocation
• Invoked echo using ProcessBuilder (this will be replaced with bugsnag-source-maps)
• Added a compatibility shim around ConfigurableFileCollection which is required to support Gradle 5.1

Testing

Ran mazerunner scenario on RN 0.60 and 0.63, confirmed that the echo command is logged out for both fixtures:

[echo, --api-key, TEST_API_KEY, --app-version, 1.0, --app-version-code, 1, --dev, false, --platform, android, --source-map, /bugsnag-android-gradle-plugin/features/fixtures/rn060/android/app/build/generated/sourcemaps/react/release/index.android.bundle.map, --bundle, /bugsnag-android-gradle-plugin/features/fixtures/rn060/android/app/build/generated/assets/react/release/index.android.bundle, --overwrite, false, --endpoint, http://localhost:9339, --project-root, /bugsnag-android-gradle-plugin/features/fixtures/rn060]