refactor(swift-sdk): data transformers

[alfie-dash]

Issue being fixed or feature implemented

Phase 2 of Swift SDK refactoring: Extract data transformation logic into centralized utilities for better code reuse and maintainability.

What was done?

Added DataTransformers.swift with centralized utilities for data conversion:

• AddressTransformer: hex/Data conversion, bech32m parsing, identity ID normalization, address formatting
• NumberTransformer: UInt64/UInt32 parsing, amount formatting, credits/duffs to Dash conversion
• ResponseParser: PlatformAddressInfo parsing and formatting utilities
• TransferInputBuilder: create transfer inputs/outputs from form string parameters

Updated ViewModels to use new transformers:

• AddressTransferViewModel
• WithdrawAddressFundsViewModel
• TopUpAddressFromAssetLockViewModel

How Has This Been Tested?

• Added 39 unit tests for all transformer functionality in DataTransformersTests.swift
• All existing tests pass (91 total tests)
• Build verified on iOS Simulator

Breaking Changes

None

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch refactor/phase-2-data-transformers

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[github-actions]

✅ DashSDKFFI.xcframework built for this PR.

• Workflow run: https://github.com/dashpay/platform/actions/runs/21635459539
• Artifacts: DashSDKFFI.xcframework (folder), DashSDKFFI.xcframework.zip, xc_checksum.txt

SwiftPM (host the zip at a stable URL, then use):

.binaryTarget(
  name: "DashSDKFFI",
  url: "https://your.cdn.example/DashSDKFFI.xcframework.zip",
  checksum: "d917a28a90ad66ee8bdd5d68b93b2249bb71140c867b9a33cad70c59fffa83a0"
)

Xcode manual integration:

• Download 'DashSDKFFI.xcframework' artifact from the run link above.
• Drag it into your app target (Frameworks, Libraries & Embedded Content) and set Embed & Sign.
• If using the Swift wrapper package, point its binaryTarget to the xcframework location or add the package and place the xcframework at the expected path.