Add actionSettings to PreApprovalElementButton

[Hopsaheysa]

#223

[Copilot]

Pull Request Overview

This PR adds support for an optional actionSettings property to the PreApprovalElementButton class in the pre-approval UI template, allowing buttons to specify additional behavior or secondary actions (e.g., "REJECT").

• Added actionSettings field to PreApprovalElementButton model class
• Updated type adapter to parse the new field from JSON
• Added comprehensive test coverage for the new property

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
library/src/main/java/com/wultra/android/mtokensdk/api/operation/model/preapproval/PreApprovalElement.kt	Added actionSettings property to PreApprovalElementButton class and updated KDoc
library/src/main/java/com/wultra/android/mtokensdk/api/operation/PreApprovalElementTypeAdapter.kt	Updated type adapter to parse actionSettings from JSON and pass it to constructor
library/src/androidTest/java/OperationUIDataTests.kt	Added test coverage for new actionSettings field including JSON fixture and assertions
docs/Using-Operations-Service.md	Updated documentation to describe the new actionSettings property in pre-approval buttons
docs/Migration-2.4.md	Updated example JSON to include actionSettings in button element