types: add VoiceRegion type

src/types/voices/voice_region.ts

@@ -0,0 +1,17 @@
+export interface VoiceRegion {
+  /** Unique ID for the region */
+  id: string;
+  /** Name of the region */
+  name: string;
+  /** True if this is a vip-only server */
+  vip: boolean;
+  /** True for a single server that is closest to the current user's client */
+  optimal: boolean;
+  /** Whether this is a deprecated voice region (avoid swithing to these) */
+  deprecated: boolean;
+  /** Whether this is a custom voice region (used for events/etc) */
+  custom: boolean;
+}
+
+/** https://discord.com/developers/docs/resources/voice#voice-region-object-voice-region-structure */
+export type DiscordVoiceRegion = VoiceRegion;