Features/291 missing flags property on edit webhook message

[BrammyS]

Description

Closes #291

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[Copilot]

Pull Request Overview

This PR adds support for message flags in webhook message editing functionality, addressing issue #291. The changes enable the passing of Discord message flags (such as SUPPRESS_EMBEDS and IS_COMPONENTS_V2) when editing webhook messages through the interaction controller.

• Added Flags property to the DiscordEditWebhookMessage record
• Updated the interaction controller to pass through the flags from response data

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
DiscordEditWebhookMessage.cs	Added Flags property with appropriate JSON serialization to support message flags
DiscordInteractionController.cs	Updated webhook message editing to include flags from response data

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