fix: eliminate auto-generated PNG density variants for ic_hcaptcha_logo (#233)

[CAMOBAP]

• [Enhancement] Eliminate auto-generated PNG density variants for ic_hcaptcha_logo #233

Enable vectorDrawables.useSupportLibrary in SDK defaultConfig and use app:srcCompat instead of android:src, so the AGP no longer generates ~50 KB of unnecessary PNG fallbacks for each density bucket.

[github-actions]

Diffuse report:

OLD: sdk-main.aar
NEW: sdk-pr.aar

 AAR      │ old      │ new      │ diff    
──────────┼──────────┼──────────┼─────────
      jar │ 59.4 KiB │ 59.4 KiB │     0 B 
 manifest │    411 B │    411 B │     0 B 
      res │ 78.2 KiB │ 28.3 KiB │ -50 KiB 
    other │    1 KiB │    1 KiB │     0 B 
──────────┼──────────┼──────────┼─────────
    total │  139 KiB │ 89.1 KiB │ -50 KiB 

 JAR     │ old │ new │ diff      
─────────┼─────┼─────┼───────────
 classes │  38 │  38 │ 0 (+0 -0) 
 methods │ 569 │ 569 │ 0 (+0 -0) 
  fields │ 174 │ 174 │ 0 (+0 -0)

AAR

 size     │ diff      │ path                                           
──────────┼───────────┼────────────────────────────────────────────────
          │ -17.1 KiB │ - res/drawable-xxxhdpi-v4/ic_hcaptcha_logo.png 
          │ -12.4 KiB │ - res/drawable-xxhdpi-v4/ic_hcaptcha_logo.png  
          │    -8 KiB │ - res/drawable-xhdpi-v4/ic_hcaptcha_logo.png   
          │  -5.7 KiB │ - res/drawable-hdpi-v4/ic_hcaptcha_logo.png    
          │    -4 KiB │ - res/drawable-mdpi-v4/ic_hcaptcha_logo.png    
          │  -2.8 KiB │ - res/drawable-ldpi-v4/ic_hcaptcha_logo.png    
          │ -10.9 KiB │ - res/drawable-anydpi-v21/ic_hcaptcha_logo.xml 
 10.9 KiB │ +10.9 KiB │ + res/drawable/ic_hcaptcha_logo.xml            
          │       0 B │ - res/drawable-anydpi-v21/                     
          │       0 B │ - res/drawable-xxxhdpi-v4/                     
          │       0 B │ - res/drawable-xxhdpi-v4/                      
          │       0 B │ - res/drawable-xhdpi-v4/                       
          │       0 B │ - res/drawable-hdpi-v4/                        
          │       0 B │ - res/drawable-ldpi-v4/                        
          │       0 B │ - res/drawable-mdpi-v4/                        
      0 B │       0 B │ + res/drawable/                                
  1.6 KiB │     +58 B │ ∆ res/layout/hcaptcha_fragment.xml             
──────────┼───────────┼────────────────────────────────────────────────
 12.5 KiB │   -50 KiB │ (total)

[github-actions]

Benchmark report:

Test name	Time ms. (median)	Allocations (median)
com.hcaptcha.sdk.HCaptchaBenchmarkTest.EMULATOR_UNLOCKED_benchmarkInvisibleVerification	+550.97	+770
com.hcaptcha.sdk.HCaptchaBenchmarkTest.EMULATOR_UNLOCKED_benchmarkInvisibleVerificationColdRun	+914.44	+1011
com.hcaptcha.sdk.HCaptchaBenchmarkTest.EMULATOR_UNLOCKED_benchmarkInvisibleSetup	+28.68	+230.33
com.hcaptcha.sdk.HCaptchaDebugInfoTest.EMULATOR_UNLOCKED_benchmarkDebugInfo	+49.61	-5591
com.hcaptcha.sdk.HCaptchaDebugInfoTest.EMULATOR_UNLOCKED_benchmarkDebugSys	+58.08	+24

[e271828-]

@CAMOBAP see #245