[WIP] Experimental: Channel Type Splitting/Abstraction Draft

[Copilot]

• Analyzed existing channel structure in DisCatSharp codebase
• Examined DiscordChannel class (1693 lines, monolithic design)
• Reviewed ChannelTypeExtensions for channel type categorization
• Identified existing inheritance: DiscordThreadChannel and DiscordDmChannel inherit from DiscordChannel
• Design abstract base class hierarchy for channel abstraction
• Implement base abstract classes in DisCatSharp.Experimental
• Create concrete channel type implementations
• Add basic thread channel abstraction
• Create validation tests
• Document the new abstraction approach

Current Analysis:
The existing DiscordChannel class is monolithic (1693 lines) and contains properties/methods for ALL channel types:

• Voice-specific: Bitrate, UserLimit, QualityMode, RtcRegion, Status
• Text-specific: Topic, LastMessageId, PerUserRateLimit
• Thread-specific: ThreadMetadata, MemberCount, MessageCount
• Forum-specific: AvailableTags, DefaultReactionEmoji, DefaultSortOrder
• Category-specific: Children property
• DM-specific: Recipients, IconHash, OwnerId

Planned Abstraction Hierarchy:

1. DiscordChannelBase - Core properties (Id, Name, Type, Position, Flags)
2. DiscordGuildChannelBase - Guild-specific (GuildId, ParentId, PermissionOverwrites)
3. DiscordTextChannelBase - Text messaging (Topic, LastMessageId, PerUserRateLimit)
4. DiscordVoiceChannelBase - Voice functionality (Bitrate, UserLimit, QualityMode)
5. DiscordThreadChannelBase - Thread functionality (ThreadMetadata, Members)

This will be implemented in DisCatSharp.Experimental as an experimental draft for future refactoring.

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