feat: add batchUnstakingBuilder and withdrawUnbondedBuilder to support unstaking in polyx

[abhijit0943]

TICKET: SC-1836

[Copilot]

Pull Request Overview

This PR implements new transaction builders to support unstaking in Polyx by introducing a BatchUnstakingBuilder and a WithdrawUnbondedBuilder along with corresponding unit tests and schema validations. Key changes include:

• Addition of unit tests and implementation for withdraw unbonded transactions.
• Introduction of the batch unstaking transaction builder with atomic execution.
• Updates to the transaction builder factory and export index to include the new builders.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
modules/sdk-coin-polyx/test/unit/transactionBuilder/withdrawUnbondedBuilder.ts	Unit tests for the withdraw unbonded builder.
modules/sdk-coin-polyx/test/unit/transactionBuilder/batchUnstakingBuilder.ts	Unit tests for the batch unstaking builder.
modules/sdk-coin-polyx/test/resources/index.ts	Added raw transaction resources for new unstaking transactions.
modules/sdk-coin-polyx/src/lib/withdrawUnbondedBuilder.ts	Implementation and validation for withdraw unbonded builder.
modules/sdk-coin-polyx/src/lib/txnSchema.ts	Added schema validations for both new builders.
modules/sdk-coin-polyx/src/lib/transactionBuilderFactory.ts	Extended factory to return new unstaking builders.
modules/sdk-coin-polyx/src/lib/index.ts	Re-exported the new builders.
modules/sdk-coin-polyx/src/lib/iface.ts	Defined interfaces for unstaking transaction arguments.
modules/sdk-coin-polyx/src/lib/batchUnstakingBuilder.ts	Implementation and validation for batch unstaking builder.