feat: Context menu for Nunjucks tag[INS-4273]

[cwangsmv]

Show different context menu when right clicks on Nunjucks tag in editor.
Add and improve the edit/copy/cut/delete action in context menu.
Currently copy and cut is not working since they do not copy tag real value.
Add delete action to delete the tag and edit action to edit the tag just like left click on tag.

Changes:

• Add handler when user right clicks on Nunjucks tag and get range and template data.
• Modify the ipcMain and ipcRenderer listeners to handle Nunjucks tag right click.
• Add edit/copy/cut/delete action handler.