[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/canStepThroughCode.kt

@@ -0,0 +1,8 @@
+// KIND: STANDALONE_LLDB
+// LLDB_TRACE: canStepThroughCode.txt
+fun main(args: Array<String>) {
+    var x = 1
+    var y = 2
+    var z = x + y
+    println(z)
+}