Handle snapshoting private preview methods and improve parameterized test naming

[rbro112]

Fixes private Preview method invocations, using Class.getDeclaredMethod as a fallback to find methods that are hidden in class.methods. We then mark the methods as accessible for invoking with reflection. Confirmed working locally on EmergeTools/nowinandroid#1

Also implements a bit nicer naming for our reflective parameterized tests. It used to just show the index of the test, but now will show something like:

reflectiveComposableInvoker[66 com.google.samples.apps.nowinandroid.feature.settings.PreviewSettingsDialog]

with the unique keyName for the composable snapshot directly in the name, making debug/attribution easier.

[rbro112]

• Handle snapshoting private preview methods and improve parameterized test naming #165 👈
• main

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[emerge-tools]

📸 Snapshot Test

4 added, 4 removed, 22 unchanged

Name	Version	Added	Removed	Modified	Unchanged	Errored	Approval
Emerge snapshots sample com.emergetools.snapshots.sample.debug	1.0 (1)	4	4	0	22	0	✅ Approved

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