K2: support implicit integer to unsigned conversions...

with dedicated opt-in language feature and special
annotation or module capability.
Not intended for a general use, solves specific K/N
scenario with interop libs.
#KT-55902 fixed

wasm/wasm.tests/tests-gen/org/jetbrains/kotlin/wasm/test/IrCodegenBoxWasmTestGenerated.java

@@ -32858,6 +32858,11 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             runTest("compiler/testData/codegen/box/unsignedTypes/nullableUnsignedEqualsLiteral.kt");
         }
 
+        @TestMetadata("signedToUnsignedConversions.kt")
+        public void testSignedToUnsignedConversions() throws Exception {
+            runTest("compiler/testData/codegen/box/unsignedTypes/signedToUnsignedConversions.kt");
+        }
+
         @TestMetadata("unsignedArraySize.kt")
         public void testUnsignedArraySize() throws Exception {
             runTest("compiler/testData/codegen/box/unsignedTypes/unsignedArraySize.kt");