[CHA-1704] Add Future Channel Bans support

[totalimmersion]

Summary

Add support for the Future Channel Bans feature.

New Parameters

• BanFromFutureChannels parameter in ban request
• RemoveFutureChannelsBan parameter in unban request

Usage

// Ban user from current channel and all future channels created by banner
await channel.BanUserAsync("user-id", new BanRequest
{
    BanFromFutureChannels = true,
    Reason = "spam"
});

// Remove future channel ban (does NOT remove existing channel bans)
await client.UnbanUserAsync("user-id", new UnbanRequest
{
    ChannelCid = "messaging:channel-id",
    CreatedBy = "banner-user-id",
    RemoveFutureChannelsBan = true
});

// Query future channel bans
var response = await client.QueryFutureChannelBansAsync(new QueryFutureChannelBansRequest
{
    FilterConditions = new Dictionary<string, object>
    {
        { "created_by_id", "banner-user-id" }
    }
});

Related PRs

• Backend: https://github.com/GetStream/chat/pull/11390

Linear

• CHA-1704

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