feat(server): basic implementation of server runtime and SDK (#13)

* feat(server): basic implementation of server runtime and SDK
* refactor: better typing

packages/server-shared/src/types/index.ts

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+export * from './websocket'

packages/server-shared/src/types/websocket/events.ts

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+export interface DiscordGuildMember {
+  nickname: string
+  displayName: string
+  id: string
+}
+
+export interface Discord {
+  guildMember?: DiscordGuildMember
+  guildId?: string
+  channelId?: string
+}
+
+interface InputSource {
+  browser: string
+  discord: Discord
+}
+
+export interface WebSocketBaseEvent<T, D> {
+  type: T
+  data: D
+}
+
+export type WithInputSource<Source extends keyof InputSource> = {
+  [S in Source]: InputSource[S]
+}
+
+// Thanks to:
+//
+// A little hack for creating extensible discriminated unions : r/typescript
+// https://www.reddit.com/r/typescript/comments/1064ibt/a_little_hack_for_creating_extensible/
+export interface WebSocketEvents {
+  'module:announce': {
+    name: string
+    possibleEvents: Array<(keyof WebSocketEvents)>
+  }
+  'input:text': {
+    text: string
+  } & Partial<WithInputSource<'browser' | 'discord'>>
+  'input:text:voice': {
+    transcription: string
+  } & Partial<WithInputSource<'browser' | 'discord'>>
+  'input:voice': {
+    audio: ArrayBuffer
+  } & Partial<WithInputSource<'browser' | 'discord'>>
+}
+
+export type WebSocketEvent = {
+  [K in keyof WebSocketEvents]: WebSocketBaseEvent<K, WebSocketEvents[K]>;
+}[keyof WebSocketEvents]

packages/server-shared/src/types/websocket/index.ts

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+export * from './events'