[Wasm] Add K2 checkers.web.common module (KT-56849)

This module is created to share JS and Wasm checker logic

Extract isEffectivelyExternal util fun from K/JS in order to
 reuse it in Wasm checkers

compiler/fir/checkers/checkers.web.common/build.gradle.kts

@@ -0,0 +1,26 @@
+plugins {
+    kotlin("jvm")
+    id("jps-compatible")
+}
+
+dependencies {
+    api(project(":compiler:fir:checkers"))
+    api(project(":core:compiler.common.wasm"))
+
+    /*
+     * We can't remove this dependency until we use
+     *   diagnostics framework from FE 1.0
+     */
+    implementation(project(":compiler:frontend"))
+    implementation(project(":compiler:psi"))
+
+    compileOnly(intellijCore())
+}
+
+sourceSets {
+    "main" {
+        projectDefault()
+        generatedDir()
+    }
+    "test" { none() }
+}

compiler/fir/checkers/checkers.web.common/src/org/jetbrains/kotlin/fir/declarations/utils/FirWebCommonHelpers.kt

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+@file:OptIn(SymbolInternals::class)
+
+package org.jetbrains.kotlin.fir.declarations.utils
+
+import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.analysis.checkers.getContainingClassSymbol
+import org.jetbrains.kotlin.fir.declarations.FirMemberDeclaration
+import org.jetbrains.kotlin.fir.symbols.FirBasedSymbol
+import org.jetbrains.kotlin.fir.symbols.SymbolInternals
+import org.jetbrains.kotlin.fir.symbols.impl.FirCallableSymbol
+import org.jetbrains.kotlin.fir.symbols.impl.FirClassSymbol
+import org.jetbrains.kotlin.fir.symbols.impl.FirPropertyAccessorSymbol
+import org.jetbrains.kotlin.fir.symbols.impl.FirPropertySymbol
+
+private val FirBasedSymbol<*>.isExternal
+    get() = when (this) {
+        is FirCallableSymbol<*> -> isExternal
+        is FirClassSymbol<*> -> isExternal
+        else -> false
+    }
+
+fun FirBasedSymbol<*>.isEffectivelyExternal(session: FirSession): Boolean {
+    if (fir is FirMemberDeclaration && isExternal) return true
+
+    if (this is FirPropertyAccessorSymbol) {
+        val property = propertySymbol
+        if (property.isEffectivelyExternal(session)) return true
+    }
+
+    if (this is FirPropertySymbol) {
+        if (getterSymbol?.isExternal == true && (!isVar || setterSymbol?.isExternal == true)) {
+            return true
+        }
+    }
+
+    return getContainingClassSymbol(session)?.isEffectivelyExternal(session) == true
+}