K2 Scripting tests: adding tests on script decls visibility

fixes (makes it stable) behavior of the script top-level declarations
visibility in K2 scripts

compiler/fir/analysis-tests/testData/resolve/scripts/scriptDeclsShouldBeVisibleFromOtherSources.fir.txt

@@ -0,0 +1,57 @@
+FILE: script.kts
+    context(<script>@R|kotlin/script/templates/standard/ScriptTemplateWithArgs|)
+    SCRIPT: <script-script.kts>
+        lval args: R|kotlin/Array<kotlin/String>|
+
+        public final val a: R|kotlin/Int| = Int(42)
+            public get(): R|kotlin/Int|
+
+        public final class A : R|kotlin/Any| {
+            public constructor(): R|A| {
+                super<R|kotlin/Any|>()
+            }
+
+        }
+
+        public final enum class E : R|kotlin/Enum<E>| {
+            private constructor(): R|E| {
+                super<R|kotlin/Enum<E>|>()
+            }
+
+            public final static enum entry V: R|E|
+            public final static fun values(): R|kotlin/Array<E>| {
+            }
+
+            public final static fun valueOf(value: R|kotlin/String|): R|E| {
+            }
+
+            public final static val entries: R|kotlin/enums/EnumEntries<E>|
+                public get(): R|kotlin/enums/EnumEntries<E>|
+
+        }
+
+        public final object O : R|kotlin/Any| {
+            private constructor(): R|O| {
+                super<R|kotlin/Any|>()
+            }
+
+            public final val v: R|kotlin/Int| = Int(42)
+                public get(): R|kotlin/Int|
+
+        }
+
+        public final fun foo(): R|kotlin/Int| {
+            ^foo Int(42)
+        }
+
+FILE: main.kt
+    public final val b: R|kotlin/Int| = R|/a|
+        public get(): R|kotlin/Int|
+    public final val ca: R|A| = R|/A.A|()
+        public get(): R|A|
+    public final val ev: R|E| = Q|E|.R|/E.V|
+        public get(): R|E|
+    public final val ov: R|kotlin/Int| = Q|O|.R|/O.v|
+        public get(): R|kotlin/Int|
+    public final val rfoo: R|kotlin/Int| = R|/foo|()
+        public get(): R|kotlin/Int|

compiler/fir/analysis-tests/testData/resolve/scripts/scriptDeclsShouldBeVisibleFromOtherSources.kts

@@ -0,0 +1,28 @@
+
+// FILE: script.kts
+
+val a = 42
+
+class A
+
+enum class E {
+    V
+}
+
+object O {
+    val v = 42
+}
+
+fun foo() = 42
+
+// FILE: main.kt
+
+val b =  a
+
+val ca = A()
+
+val ev = E.V
+
+val ov = O.v
+
+val rfoo = foo()

compiler/fir/analysis-tests/testData/resolve/scripts/scriptsDeclsMayConflict.fir.txt

@@ -0,0 +1,20 @@
+FILE: script1.kts
+    context(<script>@R|kotlin/script/templates/standard/ScriptTemplateWithArgs|)
+    SCRIPT: <script-script1.kts>
+        lval args: R|kotlin/Array<kotlin/String>|
+
+        public final val a: R|kotlin/Int| = Int(42)
+            public get(): R|kotlin/Int|
+
+FILE: script2.kts
+    context(<script>@R|kotlin/script/templates/standard/ScriptTemplateWithArgs|)
+    SCRIPT: <script-script2.kts>
+        lval args: R|kotlin/Array<kotlin/String>|
+
+        public final val a: R|kotlin/String| = String(42)
+            public get(): R|kotlin/String|
+
+FILE: main.kt
+    public final fun foo(): <ERROR TYPE REF: Ambiguity: a, [/a, /a]> {
+        ^foo <Ambiguity: a, [/a, /a]>#
+    }

compiler/fir/analysis-tests/testData/resolve/scripts/scriptsDeclsMayConflict.kts

@@ -0,0 +1,12 @@
+
+// FILE: script1.kts
+
+val a = 42
+
+// FILE: script2.kts
+
+val a = "42"
+
+// FILE: main.kt
+
+fun foo() =  <!OVERLOAD_RESOLUTION_AMBIGUITY!>a<!>