feat: add changeset tx type

[anirudhwarrier]

DEVSVCS-3460

This pull request introduces support for a new "Changeset" transaction type across several CLI commands, enabling users to output changes as YAML files for MCMS owned workflows. The implementation includes generating and writing changeset YAML files, updating handler logic to support the new transaction type, and refactoring CLI flags for consistency.

Support for "Changeset" Transaction Type and YAML File Generation:

• Added a new Changeset transaction type to the transaction handling logic, enabling commands to output changes as YAML files instead of sending transactions directly. (cmd/client/tx.go [1] [2]; cmd/client/client_factory.go [3]
• Implemented the WriteChangesetFile utility to generate or append to changeset YAML files in the appropriate directory structure, supporting workflows that require durable, auditable change records. (cmd/common/utils.go cmd/common/utils.goR220-R263)
• Updated all commands to support the new changeset flow, including constructing the correct YAML payloads and calling the new file-writing utility. (cmd/account/link_key/link_key.go [1]; cmd/account/unlink_key/unlink_key.go [2]; cmd/secrets/common/handler.go [3] [4]

Refactoring and Consistency Improvements:

• Replaced the AddRawTxFlag function with AddTxnTypeFlags and ensured AddSkipConfirmation is consistently used across all relevant CLI commands, allowing users to select transaction output type (regular, raw, ledger, or changeset) more flexibly. (cmd/account/link_key/link_key.go [1]; cmd/account/unlink_key/unlink_key.go [2]; cmd/secrets/create/create.go [3]; cmd/secrets/delete/delete.go [4]

Handler and Dependency Updates:

• Refactored handler structs and constructors to pass and use the updated settings and types required for changeset file generation, and to support the new transaction type throughout the command logic. (cmd/secrets/common/handler.go [1] [2]; cmd/account/link_key/link_key.go [3]; cmd/account/unlink_key/unlink_key.go [4]; cmd/secrets/common/handler.go [5]; cmd/secrets/delete/delete.go [6]

Smart Contract Client Updates:

• Updated the AllowlistRequest method in the workflow registry client to return a transaction output, supporting the new transaction type and enabling downstream logic to handle changeset generation. (cmd/client/workflow_registry_v2_client.go cmd/client/workflow_registry_v2_client.goL681-R712)