Added missing guild role fields

[BrammyS]

Description

Marks DiscordGuildRoleData.Color as obsolote because it is now replaced by colors.

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 missing guild role fields to support newer Discord API features. The changes expand the guild role model to include additional properties like colors, icons, tags, and flags that were previously missing from the implementation.

• Adds new role color system with primary, secondary, and tertiary colors
• Implements role tags structure for bot roles, integrations, and premium features
• Adds role flags enum and icon/emoji support

Reviewed Changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
DiscordGuildRoleData.cs	Extended with new properties for icons, colors, tags, and flags
DiscordGuildRole.cs	Updated constructor and properties to handle new role fields
DiscordGuildRoleColorsData.cs	New data model for role color structure
DiscordGuildRoleTagsData.cs	New data model for role tags with custom converter
DiscordGuildRoleFlags.cs	New enum for role flags
Various test JSON files	Updated test data to include new role properties