Add checks for const modifier applicability

1. Must be initialized in-place
2. Can not be open/abstract
3. Can not be an override
4. Can not be delegated
5. Initializer must be a compile-time constant
6. No getters
7. `const` is not applicable to vars or locals
8. `const val` should be whether top-level property or object member

compiler/testData/diagnostics/tests/modifiers/const/constInteraction.kt

@@ -0,0 +1,18 @@
+const val aConst = 1
+const val bConst = aConst + 1
+
+const val boolVal = bConst > 1 || (B.boolVal && A.boolVal)
+const val stringInterpolation = "Result: ${B.boolVal}"
+
+object A {
+    const val boolVal = bConst + 3 == 5
+
+    const val recursive1: Int = <!CONST_VAL_WITH_NON_CONST_INITIALIZER!>1 + B.recursive2<!>
+}
+
+class B {
+    companion object {
+        const val boolVal = A.boolVal
+        const val recursive2: Int = <!CONST_VAL_WITH_NON_CONST_INITIALIZER!>A.recursive1 + 2<!>
+    }
+}