TypeScript types for plugins have very unspecific types

Currently when implementing a plugin, the interface you are implementing is very unspecific about the types:

interface AnalyticsPluginBase {
      name: string;
      EVENTS?: any;
      config?: any;
      initialize?: (...params: any[]) => any;
      page?: (...params: any[]) => any;
      track?: (...params: any[]) => any;
      identify?: (...params: any[]) => any;
      loaded?: (...params: any[]) => any;
      ready?: (...params: any[]) => any;
  }

It would be great to have the specific types here to make implementing plugins easier so we know what the types are.

Start by locating the AnalyticsPluginBase interface and reviewing how plugin implementations currently use EVENTS, config, and lifecycle methods. Define more specific types for those fields and parameters, then verify that implementing plugins receive useful type checking without breaking existing plugin usage.