[Feature]: Voucher codes manipulation

[andrzejewsky]

Description of the feature

This feature allows the user to create multiple voucher codes for given voucher. It will be present during creation and edition of a given voucher.

Acceptable criteria

• As a user, I should able to see all voucher codes within a grid table, that show its code, status, and usage amount
• As a user, I can create multiple vouchers at once by using auto generated options (see mockups)
  • Auto-generation is done on the front-end side
  • I can confirm generation by clicking save button on the bottom savebar
• As a user, I can delete only newly generated codes that are not yet saved by clicking delete button on the given row
• As a user, I should see empty screen that mentions about creating new code, where there is no codes
• As a user, I can decide how many times (one or unlimited) codes can be used by clicking the ckechbox under the limits section
• As a user, I can see whether given code is active or inactive in dedicated column "status"
• As a user, I can see newly added codes with Draft status
• As a user, I can set the voucher name during creation
• As a user, I can see voucher names in the list of all vouchers
• As a user, I can see voucher name in voucher details

Additional information

• Please ping: @andrzejewsky for the designs
• This implementation includes only auto-generating voucher, any other creating way will be deliver in the next iterations
• It amends the vouchers page, but adding section with the codes, everything else stays unchanged.
• API references:
  • Allow adding multiple codes per voucher saleor#13606
  • https://github.com/orgs/saleor/projects/25/views/2 (Phase 1)