Add new CustomerSheet playground

[samer-stripe]

Summary

Adds a new version of the CustomerSheet playground using the architecture from the PaymentSheet playground.

Motivation

Makes it easier to add additional playground settings and create effective end-to-end tests.

Video

Playground.mp4

[github-actions]

Diffuse output:

OLD: identity-example-release-base.apk (signature: V1, V2)
NEW: identity-example-release-pr.apk (signature: V1, V2)

          │          compressed          │         uncompressed         
          ├───────────┬───────────┬──────┼───────────┬───────────┬──────
 APK      │ old       │ new       │ diff │ old       │ new       │ diff 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
      dex │     2 MiB │     2 MiB │  0 B │   4.3 MiB │   4.3 MiB │  0 B 
     arsc │     1 MiB │     1 MiB │  0 B │     1 MiB │     1 MiB │  0 B 
 manifest │   2.3 KiB │   2.3 KiB │  0 B │   8.1 KiB │   8.1 KiB │  0 B 
      res │ 301.5 KiB │ 301.5 KiB │  0 B │   455 KiB │   455 KiB │  0 B 
   native │   7.3 MiB │   7.3 MiB │  0 B │  18.4 MiB │  18.4 MiB │  0 B 
    asset │   1.5 MiB │   1.5 MiB │  0 B │   1.5 MiB │   1.5 MiB │  0 B 
    other │    87 KiB │    87 KiB │ +6 B │ 161.5 KiB │ 161.5 KiB │  0 B 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
    total │  12.2 MiB │  12.2 MiB │ +6 B │  25.8 MiB │  25.8 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 21683 │ 21683 │ 0 (+0 -0) 
   types │  6869 │  6869 │ 0 (+0 -0) 
 classes │  5634 │  5634 │ 0 (+0 -0) 
 methods │ 31447 │ 31447 │ 0 (+0 -0) 
  fields │ 18320 │ 18320 │ 0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  164 │  164 │  0   
 entries │ 3404 │ 3404 │  0

APK

   compressed    │   uncompressed   │                        
──────────┬──────┼───────────┬──────┤                        
 size     │ diff │ size      │ diff │ path                   
──────────┼──────┼───────────┼──────┼────────────────────────
 29.1 KiB │ +2 B │    64 KiB │  0 B │ ∆ META-INF/CERT.SF     
  1.2 KiB │ +2 B │   1.2 KiB │  0 B │ ∆ META-INF/CERT.RSA    
 25.9 KiB │ +2 B │  63.9 KiB │  0 B │ ∆ META-INF/MANIFEST.MF 
──────────┼──────┼───────────┼──────┼────────────────────────
 56.1 KiB │ +6 B │ 129.1 KiB │  0 B │ (total)

[jaynewstrom-stripe]

The old playground had a button to launch payment sheet as well (with the same config) which made it easy to test the defaults go saved between the surfaces.

[jaynewstrom-stripe]

Looks like you replaced this menu item, but didn't delete the old playground.

[jaynewstrom-stripe]

We should opt-in for the class instead.

[jaynewstrom-stripe]

I took some time to dig into this. I think we did it this way because of the PaymentOptionFactory, and the only way we can supply that to create them is via CustomerSheet.

In hindsight, we likely could have hacked around that technical limitation, and made a more compelling public API. Maybe we should reconsider before GA.

retrievePaymentOptionSelection should probably live on the adapter. But how do we allow merchants to transform it to a PaymentOption? As of now, we don't have a way to do that.