Update to use GoMobile

[JustinBeBoy]

This PR:

• Create a wrapper to export functions for GoMobile.
• Added build script for iOS and Android.

[Copilot]

Pull request overview

This PR adds GoMobile support to the libwallet project, enabling the library to be compiled and used on iOS and Android mobile platforms. The implementation creates a comprehensive wrapper layer that exposes wallet functionality through a mobile-friendly API.

Key changes include:

• Created a new gomobile package with wrapper functions for wallet operations, transactions, syncing, and address management
• Added automated build scripts for iOS (XCFramework) and Android (AAR) platforms
• Updated dependencies to include golang.org/x/mobile and related tools

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
tools.go	Adds tool dependencies for gomobile and gobind commands
go.mod	Updates Go version and adds golang.org/x/mobile dependency along with transitive dependencies
go.sum	Updates dependency checksums for new and updated packages
gomobile/gomobile.go	Core initialization and shutdown functions for the mobile library
gomobile/types.go	Type definitions, constants, and request/response structures for mobile API
gomobile/walletloader.go	Wallet lifecycle management functions (create, load, close, seed retrieval, balance, passphrase change)
gomobile/transactions.go	Transaction-related functions (create, send, list, decode, estimate fees)
gomobile/sync.go	Synchronization functions and status reporting with SPV notification handlers
gomobile/addresses.go	Address management and cryptographic operations (generate, sign, verify)
gomobile/utils.go	Helper function for safely accessing loaded wallets
gomobile/log.go	Logging infrastructure with support for both file rotation and stdout
build_gomobile_ios.sh	Comprehensive iOS build script with device/simulator support and validation
build_gomobile_android.sh	Android build script for creating AAR packages with configurable SDK versions

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