Feat add process options

[nytoan]

Description

In the iOS and Android SDK, some values are available to change the text of the process view.

CUSTOM_PAY_BUTTON_LABEL
CUSTOM_HEADER_LABEL
CUSTOM_POPUP_LABEL

i added a options parameter in the process method to be able to set them (or not).

ex :

final resultJson = await lyra.process(
        formToken,
        options: {
          'CUSTOM_PAY_BUTTON_LABEL': 'Valider',
          'CUSTOM_HEADER_LABEL': 'Montant à payer',
          'CUSTOM_POPUP_LABEL': 'Paiement en cours',
        },
      );

Type of Change

• [ x] ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore