Create a discount_codes and ticket_types model

[marcoag]

WARNING: This is an issue for the new version v3 of the eventyay backend api, make sure you are working with the dev-v3 branch, and that your PRs target that specific branch.

Depends on #9104.

Create the discount_codes and ticket_types models.

As a guidance you can use the schema from the old database that has been added here. Opening the index.html file will allow you to navigate the tables and their structure.

[techmannih]

I am working on this issue

[PaperBoardOfficial]

@marcoag @hpdang please check the PR #9118

[himanshugupta11002]

Is anyone working on this issue ? if No, then Can I take up this issue.