Form API Experiment

[toluo-stripe]

Summary

This PR is an experiment that contains

• A new form api
• An example app with samples

Motivation

Testing

• Added tests
• Modified tests
• Manually verified

Screenshots

Before	After
before screenshot	after screenshot

Changelog

[github-actions]

Risky Change

This is considered a risky change because it adjusts the sample app build.gradle, please review carefully.
We've seen issues in the past which resulted in failed builds for merchants. Please make sure the build.gradle change is intended.

By adding the label accept-risky-change to this PR, I acknowledge that I'm changing an example app and have verified that the SDK remains in a shippable state.

[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 │ +2 B │   4.1 MiB │   4.1 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 KiB │     8 KiB │  0 B 
      res │ 302.6 KiB │ 302.6 KiB │  0 B │ 456.7 KiB │ 456.7 KiB │  0 B 
   native │   6.2 MiB │   6.2 MiB │  0 B │  15.8 MiB │  15.8 MiB │  0 B 
    asset │   7.3 KiB │   7.3 KiB │  0 B │   7.1 KiB │   7.1 KiB │  0 B 
    other │  95.1 KiB │  95.1 KiB │ -8 B │ 182.2 KiB │ 182.2 KiB │  0 B 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
    total │   9.6 MiB │   9.6 MiB │ -6 B │  21.6 MiB │  21.6 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 20102 │ 20102 │ 0 (+0 -0) 
   types │  6216 │  6216 │ 0 (+0 -0) 
 classes │  5011 │  5011 │ 0 (+0 -0) 
 methods │ 29963 │ 29963 │ 0 (+0 -0) 
  fields │ 17341 │ 17341 │ 0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  164 │  164 │  0   
 entries │ 3643 │ 3643 │  0

APK

   compressed    │  uncompressed  │                    
──────────┬──────┼─────────┬──────┤                    
 size     │ diff │ size    │ diff │ path               
──────────┼──────┼─────────┼──────┼────────────────────
 28.9 KiB │ -8 B │  64 KiB │  0 B │ ∆ META-INF/CERT.SF 
    2 MiB │ +2 B │ 4.1 MiB │  0 B │ ∆ classes.dex      
──────────┼──────┼─────────┼──────┼────────────────────
    2 MiB │ -6 B │ 4.2 MiB │  0 B │ (total)