refactor(comment): create custom comment table

[ravinderk]

User Story

Give uses WordPress comment functionality. In Give, the comment is mostly used as a note for record activity of donor or donation and donor comment (if enabled): Few plugins start flagging these comment a spam, so in some case, donation process but donor does not notify successfully that means they land on error page instead of donation receipt page.

To prevent this issue we will create a custom comment table to store donation and donor activity.

ToDo

• Custom Table
  • Create custom table
  • Add helper functions
  • Add comment query caching ( not important, because comment query is not expensing and for now only query for comment on donation detail page )
• Add DB upgrade
• Review backward compatibility
• Testing
  • Review DB upgrade
  • Donor wall shortcode
  • GDPR plugin (after db upgrade)
  • Mojo Market place plugin (after db upgrade)
  • Addons
    • Manual Donation
    • Stripe
    • Paypal Pro
    • Recurring
      Note: most payment gateways uses give_insert_payment_note helper function.
• Write developer blog post