FIR: Explicitlty separate static and member scopes

For Java, they have rather different semantics considering "overrides"
and obtaining functions/properties from supertypes

See the Java statics implementation

compiler/fir/tree/src/org/jetbrains/kotlin/fir/scopes/FirTypeScope.kt

@@ -36,4 +36,11 @@ abstract class FirTypeScope : FirScope() {
 
         return baseScope.processOverriddenFunctions(functionSymbol, processor)
     }
+
+    object Empty : FirTypeScope() {
+        override fun processOverriddenFunctions(
+            functionSymbol: FirFunctionSymbol<*>,
+            processor: (FirFunctionSymbol<*>) -> ProcessorAction
+        ): ProcessorAction = ProcessorAction.NEXT
+    }
 }

compiler/fir/tree/src/org/jetbrains/kotlin/fir/symbols/impl/FirCallableSymbol.kt

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.fir.symbols.impl
 
 import org.jetbrains.kotlin.fir.declarations.FirCallableDeclaration
+import org.jetbrains.kotlin.fir.declarations.FirMemberDeclaration
 import org.jetbrains.kotlin.fir.symbols.AbstractFirBasedSymbol
 import org.jetbrains.kotlin.fir.symbols.CallableId
 
@@ -16,6 +17,8 @@ abstract class FirCallableSymbol<D : FirCallableDeclaration<D>> : AbstractFirBas
         get() = null
 }
 
+val FirCallableSymbol<*>.isStatic: Boolean get() = (fir as? FirMemberDeclaration)?.status?.isStatic == true
+
 inline fun <reified E : FirCallableSymbol<*>> E.unwrapSubstitutionOverrides(): E {
     var current = this
     while (current.overriddenSymbol != null) {