🚧 fix: allow for announcement. rule, forum, and stage channel types

[evolvewithevan]

🚧 fix: allow for announcement, rule, forum, and stage channel types

Summary

GitCord currently lacks support for several specialized Discord channel types. This can cause runtime issues, skipped functionality, or incorrect assumptions in type-checking and channel parsing logic.

Channel Types to Support

• Announcement (GUILD_ANNOUNCEMENT, type 5)
• Rules (GUILD_RULES, type 15)
• Forum (GUILD_FORUM, type 15) (same as Rules; may need conditional handling)
• Stage (GUILD_STAGE_VOICE, type 13)

Tasks

• Update type checking logic to include these channel types
• Adjust filtering/parsing logic to avoid skipping these valid types
• Update schema/type definitions (e.g., TypeScript or runtime validation)
• Add test cases if applicable