Use dataclasses as a structure for payment's gateways

[korycins]

#3678

[NyanKiyoshi]

What about the payment_information: Dict? Is it planned or?

It's generated by this:
https://github.com/mirumee/saleor/blob/d54ab16024d55f78ce2c4a7cf014f02952b5a9dd/saleor/payment/utils.py#L48-L68

[codecov]

Codecov Report

Merging #4028 into master will decrease coverage by 0.09%.
The diff coverage is 97.45%.

@@            Coverage Diff            @@
##           master    #4028     +/-   ##
=========================================
- Coverage   91.37%   91.28%   -0.1%     
=========================================
  Files         274      276      +2     
  Lines       14947    14975     +28     
  Branches     1451     1445      -6     
=========================================
+ Hits        13658    13670     +12     
- Misses        898      913     +15     
- Partials      391      392      +1

Impacted Files	Coverage Δ
saleor/payment/gateways/stripe/forms.py	96.66% <100%> (+0.23%)	⬆️
saleor/payment/gateways/razorpay/forms.py	96.96% <100%> (+0.09%)	⬆️
saleor/payment/gateways/braintree/__init__.py	100% <100%> (ø)	⬆️
saleor/payment/interface.py	100% <100%> (ø)
saleor/payment/gateways/razorpay/__init__.py	98.5% <100%> (+0.02%)	⬆️
saleor/payment/gateways/braintree/forms.py	95% <100%> (+0.26%)	⬆️
saleor/payment/gateways/stripe/__init__.py	98.95% <100%> (+0.01%)	⬆️
saleor/payment/gateways/stripe/utils.py	100% <100%> (ø)	⬆️
saleor/payment/gateways/dummy/__init__.py	100% <100%> (ø)	⬆️
saleor/payment/utils.py	92.13% <87.5%> (-0.72%)	⬇️
... and 4 more

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@0c22560). Click here to learn what that means.
The diff coverage is 97.69%.

@@            Coverage Diff            @@
##             master    #4028   +/-   ##
=========================================
  Coverage          ?   91.32%           
=========================================
  Files             ?      275           
  Lines             ?    14958           
  Branches          ?     1448           
=========================================
  Hits              ?    13660           
  Misses            ?      904           
  Partials          ?      394

Impacted Files	Coverage Δ
saleor/payment/gateways/stripe/forms.py	96.66% <100%> (ø)
saleor/payment/gateways/razorpay/forms.py	96.87% <100%> (ø)
saleor/payment/gateways/braintree/__init__.py	100% <100%> (ø)
saleor/payment/interface.py	100% <100%> (ø)
saleor/payment/gateways/razorpay/__init__.py	98.5% <100%> (ø)
saleor/payment/gateways/braintree/forms.py	95% <100%> (ø)
saleor/payment/gateways/stripe/__init__.py	98.95% <100%> (ø)
saleor/payment/gateways/stripe/utils.py	100% <100%> (ø)
saleor/payment/gateways/dummy/__init__.py	100% <100%> (ø)
saleor/payment/utils.py	92.13% <87.5%> (ø)

---

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[michaljelonek]

Also I would personally add removing support for 3.5 as a separate changelog entry. I realise you can deduce that by the word dataclass, but imo it's implied and not really that obvious, I think being explicit here for such change would be better.