Fix COMPOSITION_IMPL inspector for new Compose state field structure

Fixes NullPointerException when analyzing heap dumps from newer Compose versions
where CompositionImpl uses "state" int field instead of "disposed" boolean field.

The inspector now gracefully handles both field structures:
- Old Compose: disposed boolean field (backward compatibility)
- New Compose: state int field with values RUNNING=0, DISPOSED=3, etc.
- Edge case: neither field exists (graceful fallback)

Before: NullPointerException at AndroidObjectInspectors$COMPOSITION_IMPL$inspect line 792
After: Analysis completes successfully with proper state detection

Fixes: https://github.com/square/leakcanary/issues/2781

Co-Authored-By: Claude <noreply@anthropic.com>