[Wasm] Loader improvements

- Output ES modules instead of plain files
- Support -Xwasm-launcher=d8 for d8 shell used in tests and benchmarks.
- Reuse launcher generation logic in CLI and box tests runners.
- Create separate output directory for each box since
  there are multiple output files generated for each test.
- Stop using absolute paths in generate JS files
  to simplify running generated code on different machine
- Remove ">>>" from println output


Merge-request: KT-MR-5729
Merged-by: Svyatoslav Kuzmich <svyatoslav.kuzmich@jetbrains.com>

compiler/testData/codegen/boxWasmJsInterop/functionTypes.kt

@@ -241,6 +241,14 @@ fun box(): String {
     return "OK"
 }
 
+// TODO: Rewrite test to use module system
+@JsFun("() => { globalThis.main = wasmExports; }")
+external fun hackNonModuleExport()
+
+fun main() {
+    hackNonModuleExport()
+}
+
 // FILE: functionTypes__after.js
 
 const exportedFres = main.exportedF()(1, 20, 300)("<", ">");

compiler/testData/codegen/boxWasmJsInterop/jsExport.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND: JS_IR, JS
 // MODULE: main
 // FILE: externals.kt
 
@@ -25,6 +26,15 @@ fun anyAsEI(any: Any): EI = any as EI
 
 fun box(): String = "OK"
 
+// TODO: Rewrite test to use module system
+
+@JsFun("() => { globalThis.main = wasmExports; }")
+external fun hackNonModuleExport()
+
+fun main() {
+    hackNonModuleExport()
+}
+
 // FILE: jsExport__after.js
 
 const c = main.makeC(300);