Introduces a generated Go SDK client for the Lethean Blockchain API, including OpenAPI spec, models, API interfaces, documentation, and tests. This enables Go applications to interact with Lethean blockchain endpoints for block, info, and transaction operations.
Expanded the OpenAPI specification to include new endpoints, updated server URLs, and revised schema definitions for improved clarity and coverage. The API description was updated and several new models and parameters were added to support additional blockchain and daemon functionality.
Added linguist-generated attribute for SDK clients in .gitattributes to hide them in GitHub diffs. Enhanced utils/sdk/Makefile with target-specific hooks, improved ignore file handling, and refined Go client build steps. Updated Go SDK config to use 'lthn' as package name and set isGoSubmodule property.
