feat: add generic key/value secure data API (closes #46)

[riderx]

Summary

• Adds setData, getData, getSecureData, deleteData, and isDataSaved for arbitrary encrypted string payloads
• Keeps existing credential helpers (setCredentials, etc.) fully backward compatible
• Reuses the same Android Keystore / iOS Keychain backends; biometric-protected values use accessControl + getSecureData()

Usage

// Store a PIN or any string (serialize objects with JSON.stringify)
await NativeBiometric.setData({ key: 'user-pin', value: '1234' });

// Read back (no biometric prompt)
const { value } = await NativeBiometric.getData({ key: 'user-pin' });

// Biometric-protected storage
await NativeBiometric.setData({
  key: 'session-token',
  value: token,
  accessControl: AccessControl.BIOMETRY_ANY,
});
const { value: secureToken } = await NativeBiometric.getSecureData({
  key: 'session-token',
  reason: 'Unlock your session',
});

Closes #46

Test plan

• bun run verify (iOS Swift build, Android Gradle test+lint, web bundle)
• Manual: store/read/delete a PIN via setData/getData on device
• Manual: store/read protected value via setData + getSecureData with biometrics

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📥 Commits

Reviewing files that changed from the base of the PR and between 0624da7 and 3060c81.

📒 Files selected for processing (6)

• README.md
• android/src/main/java/ee/forgr/biometric/AuthActivity.java
• android/src/main/java/ee/forgr/biometric/NativeBiometric.java
• ios/Sources/NativeBiometricPlugin/NativeBiometricPlugin.swift
• src/definitions.ts
• src/web.ts

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