chore: Reduce delta on ports to blockly-samples (#6886)

* Reduce usage of obsolete .keyCode property.
* Rename private properties/methods which violate eslint rules.
* Use arrays of bound events rather than individual properties.
* Improve typing info.
* Also fix O(n^2) recursive performance issue in theme's getComponentStyle function.
* And replace String(...) with '${...}' (smaller, faster).
* .toString() is considered harmful.

scripts/gulpfiles/test_tasks.js

@@ -59,7 +59,7 @@ function runTestTask(id, task) {
         successCount++;
         if (process.env.CI) console.log('::endgroup::');
         console.log(`${BOLD_GREEN}SUCCESS:${ANSI_RESET} ${id}`);
-        results[id] = {success: true}; 
+        results[id] = {success: true};
         resolve(result);
       })
       .catch((err) => {
@@ -191,8 +191,8 @@ function compareSize(file, expected) {
     const message = `Failed: Previous size of ${name} is undefined.`;
     console.log(`${BOLD_RED}${message}${ANSI_RESET}`);
     return 1;
-  } 
-  
+  }
+
   if (size > compare) {
     const message = `Failed: ` +
         `Size of ${name} has grown more than 10%. ${size} vs ${expected}`;