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.

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -5,7 +5,7 @@ body:
   - type: markdown
     attributes:
       value: >
-        Thank you for taking the time to fill out a bug report! 
+        Thank you for taking the time to fill out a bug report!
         If you have a question about how to use Blockly in your application,
         please ask on the [forum](https://groups.google.com/forum/#!forum/blockly) instead of filing an issue.
   - type: checkboxes

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -6,7 +6,7 @@ body:
   - type: markdown
     attributes:
       value: >
-        Thank you for taking the time to fill out a feature request! 
+        Thank you for taking the time to fill out a feature request!
         If you have a question about how to use Blockly in your application,
         please ask on the [forum](https://groups.google.com/forum/#!forum/blockly) instead of filing an issue.
   - type: checkboxes