[LL FIR] add more tests for script initializer

^KT-65344

analysis/low-level-api-fir/testData/getOrBuildFir/expressions/firstStatementCall.txt

@@ -0,0 +1,27 @@
+KT element: KtCallExpression
+FIR element: FirFunctionCallImpl
+FIR source kind: KtRealSourceElementKind
+
+FIR element rendered:
+R|/foo|()
+
+FIR FILE:
+FILE: [ResolvedTo(IMPORTS)] firstStatementCall.kts
+    context(<script>@R|kotlin/script/templates/standard/ScriptTemplateWithArgs|)
+    SCRIPT: [ResolvedTo(BODY_RESOLVE)] <script-firstStatementCall.kts>
+        [ResolvedTo(BODY_RESOLVE)] lval args: R|kotlin/Array<kotlin/String>|
+
+        public final [ResolvedTo(IMPLICIT_TYPES_BODY_RESOLVE)] fun foo(): R|kotlin/Int| {
+            ^foo Int(4)
+        }
+
+        [ResolvedTo(BODY_RESOLVE)] init {
+            R|/foo|()
+        }
+
+        [ResolvedTo(BODY_RESOLVE)] init {
+            R|/bar|()
+        }
+
+        public final [ResolvedTo(CONTRACTS)] fun bar(): R|kotlin/Unit| {
+        }