Add bindings support for mobile pay.

[jaynewstrom-stripe]

Summary

Adds bindings support for mobile pay, and adds a test for mobile pay to payment sheet.

https://admin.corp.stripe.com/object/pm_1O0PwIKG6vc7r7YCmFwO8lz6

Motivation

Merchant ask.

Testing

• Added tests
• Modified tests
• Manually verified

Changelog

Added bindings support for MobilePay. See private beta information.

[github-actions]

Diffuse output:

OLD: paymentsheet-example-release-master.apk (signature: V1, V2)
NEW: paymentsheet-example-release-pr.apk (signature: V1, V2)

          │          compressed          │         uncompressed         
          ├───────────┬───────────┬──────┼───────────┬───────────┬──────
 APK      │ old       │ new       │ diff │ old       │ new       │ diff 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
      dex │   3.5 MiB │   3.5 MiB │  0 B │   7.7 MiB │   7.7 MiB │  0 B 
     arsc │   2.2 MiB │   2.2 MiB │  0 B │   2.2 MiB │   2.2 MiB │  0 B 
 manifest │     5 KiB │     5 KiB │  0 B │  24.9 KiB │  24.9 KiB │  0 B 
      res │ 898.7 KiB │ 898.7 KiB │  0 B │   1.3 MiB │   1.3 MiB │  0 B 
   native │   2.6 MiB │   2.6 MiB │  0 B │     6 MiB │     6 MiB │  0 B 
    asset │     3 MiB │     3 MiB │  0 B │     3 MiB │     3 MiB │  0 B 
    other │ 203.6 KiB │ 203.6 KiB │  0 B │ 458.6 KiB │ 458.6 KiB │  0 B 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
    total │  12.4 MiB │  12.4 MiB │  0 B │  20.7 MiB │  20.7 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 38088 │ 38088 │ 0 (+0 -0) 
   types │ 12515 │ 12515 │ 0 (+0 -0) 
 classes │ 10517 │ 10517 │ 0 (+0 -0) 
 methods │ 54977 │ 54977 │ 0 (+0 -0) 
  fields │ 35095 │ 35095 │ 0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  292 │  292 │  0   
 entries │ 6913 │ 6913 │  0