feat: add highlightjs-copy (#228)

[skip ci]

highlightjs plugin,  add a copy button to codeblocks.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Integrated the `highlightjs-copy` library for enhanced code
highlighting functionality.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

package.json

@@ -7068,6 +7068,9 @@
     "highlighter": {
       "version": "*"
     },
+    "highlightjs-copy": {
+      "version": "*"
+    },
     "highlightjs-solidity": {
       "version": "*"
     },