feat: create standard coupon

[vanpho93]

Resolves #6723
Impact: major
Type: feature

Solution

Creating the mutation allows the admin can create a standard coupon.

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Latest commit: 13b876e

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[zenweasel]

Broken unit tests and broken DCO.

Also, I think we should be moving coupon work into a separate feature branch so we can test the existing functionality separately.

[tedraykov]

Why is the coupon referred to as Standard Coupon? Does that imply there are nonstandard coupons? If the collection name is just Coupon do we need to overstate that it is a standard one?

Apart from that the PR looks good.

[vanpho93]

Why is the coupon referred to as Standard Coupon? Does that imply there are nonstandard coupons? If the collection name is just Coupon do we need to overstate that it is a standard one?

@tedraykov a standard coupon does not require userId so it can be applied by anyone.

[tedraykov]

This can't be implied from the naming alone, but I haven't seen the full specs for the coupons so I'll take it as is.

The base branch was changed.