fix(swc-loader): Propagate extra build info through swc-loader (#121)

# Summary

At Canva, we use some transform steps in our webpack config before
`swc-loader` runs, which collects module build info / metadata to be
used in the webpack plugins stage. What we noticed is that `swc-loader`
is dropping that additional build info for some reason, which means we
won't be able to consume it down the line.

Seems like just adding a third parameter to the `makeLoader` returned
function and passing it through to the callbacks works correctly.

Let me know if this change looks good!

Author: Davit-G

.changeset/bright-drinks-tap.md

@@ -0,0 +1,5 @@
+---
+"swc-loader": patch
+---
+
+Pass through incoming extra build info to output

packages/swc-loader/src/index.js

@@ -1,7 +1,7 @@
 const swc = require("@swc/core");
 
 function makeLoader() {
-    return function (source, inputSourceMap) {
+    return function (source, inputSourceMap, extra) {
         // Make the loader async
         const callback = this.async();
         const filename = this.resourcePath;
@@ -91,15 +91,17 @@ function makeLoader() {
                 callback(
                     null,
                     output.code,
-                    parseMap ? JSON.parse(output.map) : output.map
+                    parseMap ? JSON.parse(output.map) : output.map,
+                    extra
                 );
             } else {
                 swc.transform(source, programmaticOptions).then(
                     (output) => {
                         callback(
                             null,
                             output.code,
-                            parseMap ? JSON.parse(output.map) : output.map
+                            parseMap ? JSON.parse(output.map) : output.map,
+                            extra
                         );
                     },
                     (err) => {