[AA] Add symbol tests for symbols from JS klibs

Use test compiler runner to compile JS libraries. Determine compiler
by the specified TARGET_PLATFORM. Add tests for dynamic type and
JS-specific .proto extensions.

Refactor the code for mock library compilation to make the switch
between platforms more straightforward.

KTIJ-27566
KT-63217

analysis/low-level-api-fir/testData/getOrBuildFirBinary/js/fileJsModule.kt

@@ -0,0 +1,5 @@
+// DECLARATION_TYPE: org.jetbrains.kotlin.psi.KtFunction
+
+@file:JsModule("extModule")
+package ext.jspackage.name
+external fun foo()