FIR IDE: move low level api testdata sources to the analysis directory

analysis/low-level-api-fir/testdata/innerDeclarationsResolve/lambdasInWithBodyFunction.kt

@@ -0,0 +1,15 @@
+inline fun <T, R> with(receiver: T, block: T.() -> R): R {
+    return receiver.block()
+}
+
+inline fun <T, R> T.let(block: (T) -> R): R {
+    return block(this)
+}
+
+class A {
+    fun foo() {
+        val a = with(1) {
+            this.let { it }
+        }.let { 2 }
+    }
+}