Make PaymentLauncher.create methods Java-friendly

[tillh-stripe]

Summary

This pull request adds JvmOverloads and JvmStatic to the PaymentLauncher.create() methods for better Java interop.

Motivation

Trying to avoid writing PaymentLauncher.Companion.create() in the Cash App Pay docs.

Testing

• Added tests
• Modified tests
• Manually verified

Screenshots

Before	After
before screenshot	after screenshot

Changelog

[github-actions]

Diffuse output:

OLD: paymentsheet-example-release-master.apk (signature: none)
NEW: paymentsheet-example-release-pr.apk (signature: none)

          │          compressed          │          uncompressed          
          ├──────────┬──────────┬────────┼───────────┬───────────┬────────
 APK      │ old      │ new      │ diff   │ old       │ new       │ diff   
──────────┼──────────┼──────────┼────────┼───────────┼───────────┼────────
      dex │  5.8 MiB │  5.8 MiB │ +234 B │    15 MiB │    15 MiB │ +548 B 
     arsc │  2.1 MiB │  2.1 MiB │    0 B │   2.1 MiB │   2.1 MiB │    0 B 
 manifest │  4.4 KiB │  4.4 KiB │    0 B │    21 KiB │    21 KiB │    0 B 
      res │  1.1 MiB │  1.1 MiB │    0 B │   1.9 MiB │   1.9 MiB │    0 B 
   native │  2.6 MiB │  2.6 MiB │    0 B │     6 MiB │     6 MiB │    0 B 
    asset │    3 MiB │    3 MiB │ +211 B │     3 MiB │     3 MiB │ +211 B 
    other │ 83.2 KiB │ 83.2 KiB │    0 B │ 159.6 KiB │ 159.6 KiB │    0 B 
──────────┼──────────┼──────────┼────────┼───────────┼───────────┼────────
    total │ 14.6 MiB │ 14.6 MiB │ +445 B │  28.2 MiB │  28.2 MiB │ +759 B 

         │          raw           │            unique            
         ├────────┬────────┬──────┼────────┬────────┬────────────
 DEX     │ old    │ new    │ diff │ old    │ new    │ diff       
─────────┼────────┼────────┼──────┼────────┼────────┼────────────
   files │      2 │      2 │    0 │        │        │            
 strings │  92934 │  92935 │   +1 │  77731 │  77732 │ +1 (+2 -1) 
   types │  24444 │  24445 │   +1 │  22099 │  22100 │ +1 (+1 -0) 
 classes │  19882 │  19883 │   +1 │  19882 │  19883 │ +1 (+1 -0) 
 methods │ 105567 │ 105574 │   +7 │ 101233 │ 101240 │ +7 (+7 -0) 
  fields │ 102761 │ 102761 │    0 │ 101476 │ 101476 │  0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  333 │  333 │  0   
 entries │ 6886 │ 6886 │  0

APK

    compressed    │   uncompressed    │                               
─────────┬────────┼──────────┬────────┤                               
 size    │ diff   │ size     │ diff   │ path                          
─────────┼────────┼──────────┼────────┼───────────────────────────────
 2.3 MiB │ +233 B │  6.5 MiB │ +548 B │ ∆ classes2.dex                
 8.2 KiB │ +211 B │  8.1 KiB │ +211 B │ ∆ assets/dexopt/baseline.prof 
 3.4 MiB │   +1 B │  8.5 MiB │    0 B │ ∆ classes.dex                 
─────────┼────────┼──────────┼────────┼───────────────────────────────
 5.8 MiB │ +445 B │ 15.1 MiB │ +759 B │ (total)

DEX

STRINGS:

   old   │ new   │ diff       
  ───────┼───────┼────────────
   77731 │ 77732 │ +1 (+2 -1) 
  + ~~R8{backend:dex,compilation-mode:release,has-checksums:false,min-api:21,pg-map-id:2851bf3,r8-mode:compatibility,version:4.0.48}
  + Lcom/stripe/android/payments/paymentlauncher/a;
  
  - ~~R8{backend:dex,compilation-mode:release,has-checksums:false,min-api:21,pg-map-id:a18b0f7,r8-mode:compatibility,version:4.0.48}
  

TYPES:

   old   │ new   │ diff       
  ───────┼───────┼────────────
   22099 │ 22100 │ +1 (+1 -0) 
  + Lcom/stripe/android/payments/paymentlauncher/a;
  

METHODS:

   old    │ new    │ diff       
  ────────┼────────┼────────────
   101233 │ 101240 │ +7 (+7 -0) 
  + com.stripe.android.payments.paymentlauncher.PaymentLauncher_Companion create(ComponentActivity, String, PaymentLauncher_PaymentResultCallback) → PaymentLauncher
  + com.stripe.android.payments.paymentlauncher.PaymentLauncher_Companion create(Fragment, String, PaymentLauncher_PaymentResultCallback) → PaymentLauncher
  + com.stripe.android.payments.paymentlauncher.a <clinit>()
  + com.stripe.android.payments.paymentlauncher.a a(ComponentActivity, String, PaymentLauncher_PaymentResultCallback) → PaymentLauncher
  + com.stripe.android.payments.paymentlauncher.a b(ComponentActivity, String, String, PaymentLauncher_PaymentResultCallback) → PaymentLauncher
  + com.stripe.android.payments.paymentlauncher.a c(Fragment, String, PaymentLauncher_PaymentResultCallback) → PaymentLauncher
  + com.stripe.android.payments.paymentlauncher.a d(Fragment, String, String, PaymentLauncher_PaymentResultCallback) → PaymentLauncher