feat: add scm tag arg to create task

[sherwino]

Description

Add optional SCM tag parameter to SDK creation task

Overview

This PR adds an optional scm_tag parameter to the zapp_sdks:create rake task, allowing users to specify a custom SCM tag that differs from the version number.

Background

Currently, the zapp_sdk_tasks gem hardcodes the SCM tag to match the version number. However, for platform-specific releases like TV 7.0.2, we need the ability to use platform-specific tags (e.g., webos-7.0.2, tizen-7.0.2) while maintaining the same base version number.

Changes

• Added an optional scm_tag parameter to the zapp_sdks:create rake task
• Updated the SdkHelper.zapp_request_params method to use the provided SCM tag, falling back to the version if not provided
• Added appropriate test cases for the new functionality
• Updated the README to document the new parameter and include the additional supported platforms (samsung_tv, lg_tv, vizio)

Testing

All specs have been updated and tested with:

• No SCM tag provided (maintains backward compatibility)
• Custom SCM tag provided

Example Usage

Before:

bundle exec rake zapp_sdks:create[webos,7.0.2,zapp-web-tvs,token]
# Uses scm_tag = "7.0.2"

After:

bundle exec rake zapp_sdks:create[webos,7.0.2,zapp-web-tvs,token,webos-7.0.2]
# Uses scm_tag = "webos-7.0.2"

Backward Compatibility

This change is fully backward compatible. Existing scripts that don't provide the SCM tag will continue to work as before, using the version as the SCM tag.

[sherwino]

@alexzchut could you please take a look at this one when you have a chance?