feat(sdk-coin-canton): added pre-approval builder

[ravibitgo]

Ticket: COIN-5918

[Copilot]

Pull Request Overview

This PR implements a pre-approval builder for Canton transactions, allowing 1-step pre-approval functionality. It adds support for creating one-step enablement requests that can be used to set up pre-approvals in the Canton blockchain network.

• Added OneStepPreApproval transaction type to the SDK core enum
• Implemented OneStepPreApprovalBuilder class with full validation and request object generation
• Enhanced transaction and builder classes with proper validation and hash computation methods

Reviewed Changes

Copilot reviewed 11 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
modules/sdk-core/src/account-lib/baseCoin/enum.ts	Added OneStepPreApproval transaction type enum
modules/sdk-coin-canton/src/lib/oneStepPreApprovalBuilder.ts	New builder class for creating one-step pre-approval requests
modules/sdk-coin-canton/src/lib/iface.ts	Added interfaces for one-step enablement requests
modules/sdk-coin-canton/src/lib/transactionBuilder.ts	Enhanced base builder with validation methods and removed unused code
modules/sdk-coin-canton/src/lib/transaction/transaction.ts	Updated transaction class with proper getters/setters and new methods
modules/sdk-coin-canton/src/lib/transferBuilder.ts	Added setTransaction method implementation
modules/sdk-coin-canton/src/lib/utils.ts	Added hash computation method for prepare submission responses
modules/sdk-coin-canton/resources/hash/hash.js	Added hash computation utilities for Canton transactions
modules/sdk-coin-canton/test/unit/builder/oneStepEnablement/oneStepEnablementBuilder.ts	Comprehensive test suite for the new builder
modules/sdk-coin-canton/test/unit/utils.ts	Added tests for new hash computation functionality
modules/sdk-coin-canton/src/lib/walletInitialization/walletInitTransaction.ts	Removed unused Buffer import

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[baltiyal]

lgtm

[at31416]

lgtm