[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/samples/standalone_lldb_stepping.kt

@@ -0,0 +1,10 @@
+// KIND: STANDALONE_LLDB
+// LLDB_TRACE: standalone_lldb_stepping.txt
+import kotlin.test.*
+
+fun main(args: Array<String>) {
+    var x = 1
+    var y = 2
+    var z = x + y
+    println(z)
+}

native/native.tests/testData/samples/standalone_lldb_stepping.txt

@@ -0,0 +1,28 @@
+> b main.kt:6
+Breakpoint 1: [..]
+> r
+Process [..] stopped
+[..] stop reason = breakpoint 1.1
+[..] at main.kt:6[..]
+   3   	import kotlin.test.*
+   4
+   5   	fun main(args: Array<String>) {
+-> 6   	    var x = 1
+   7   	    var y = 2
+   8   	    var z = x + y
+   9   	    println(z)
+> n
+Process [..] stopped
+[..] stop reason = step over
+[..] at main.kt:7[..]
+> n
+Process [..] stopped
+[..] stop reason = step over
+[..] at main.kt:8[..]
+> n
+Process [..] stopped
+[..] stop reason = step over
+[..] at main.kt:9[..]
+> q
+
+