[K/N] Migrate LLDB test to blackboxtest

This change only introduces a single sample test together
with the necessary plumbing for basic LLDB testing.
Migrating the rest of the tests over and introducing more
complex interop setups will be tackled as a follow-up.

native/native.tests/testData/lldb/canInspectArrayChildren.txt

@@ -0,0 +1,5 @@
+> b main.kt:5
+> r
+> fr var xs
+(ObjHeader *) xs = [..., ..., ...]
+> q