[atomicfu-JVM] Preparation for commonization of JVM and K/N transformers

The following updates in the JVM/IR plugin were made:
* Lots of refactoring with preparation for K/N support: commonization of transformations.
* Improved error handling (checks for visibility constraints, appending message about usage constraints in case of an error).
* Explicit requirements for the visibility of atomic properties: to prevent leaking they should be private/internal or be members of private/internal classes.
* Fixed visibility of generated properties: volatile properties are always private and atomic updaters have the same visibility as the original atomic property.
* Volatile fields are generated from scratch and original atomic properties are removed.
* Delegated properties support is fixed (only declaration in the same scope is allowed).
* Non-inline atomic extensions are forbidden.
* For top-level atomics: only one wrapper class per file (with corresponding visibility) is generated.
* Bug fixes.

The corresponding tickets: 
https://github.com/Kotlin/kotlinx-atomicfu/issues/322
KT-60528



Merge-request: KT-MR-10579
Merged-by: Maria Sokolova <maria.sokolova@jetbrains.com>

plugins/atomicfu/atomicfu-compiler/testData/box/atomics_basic/MultiInitTest.kt

@@ -0,0 +1,30 @@
+import kotlinx.atomicfu.*
+import kotlin.test.*
+
+class MultiInitTest {
+    fun testBasic() {
+        val t = MultiInit()
+        check(t.incA() == 1)
+        check(t.incA() == 2)
+        check(t.incB() == 1)
+        check(t.incB() == 2)
+    }
+}
+
+class MultiInit {
+    private val a = atomic(0)
+    private val b = atomic(0)
+
+    fun incA() = a.incrementAndGet()
+    fun incB() = b.incrementAndGet()
+
+    companion object {
+        fun foo() {} // just to force some clinit in outer file
+    }
+}
+
+fun box(): String {
+    val testClass = MultiInitTest()
+    testClass.testBasic()
+    return "OK"
+}